Chevrolet Head Casting Number Reference
Small Blocks
330545        350      73       Corvette  76cc  2.02 / 1.6 Valves
333881        350      74-75  76cc  2.02 / 1.6 Valves
333882      350-400 74-80  76cc 160 / 60cc Ports
340292                                "Turbo"  Angle Plug, 64cc, 2.02 / 1.6 valves
354434      262-267-30575-79   163/57 cc Ports   Light Weight Casting
358741      305        76-79
376450      262,305,350 84-81 168 / 60cc Ports
376455      350         77-85
458642      350-400  67-70
462624      350-400  75-86 161 / 62cc Ports
468642      350-400  76-80  Small Spark Plugs
471513      267,350  79
517513      267,350  79
3030817    400         74
3636839    265         55
3703523    265         55      Corvette
3703524    265         55
3713358    265         55-56
3713569    265         55-56
3720991    265         56-57
3731262    265         56     2  4 Barrel Carburetors  Corvette
3725306    265         56-57
3731539                   57       Corvette Fuel Injected
3731544    283         57-61
3731548    283         57-62
3731554    283         57-61
3731556    283         57       Truck
3731762    265                    2  4 Four Barrel Carburetors 56 Corvette
3737739    283         57-62  Corvette Fuel Injected
3737775    283,327  62-67
3740997    283         57
3743056    283         58
3743096    327         62-67 G.M.C Truck
3747363    283         57-61
3747460    283, 327 59-67
3748720    283         57-58
3748770    283                      1 - 4 Barrel and , 2 - 4 Barrel  Carburetor,  Corvette Fuel Injected X 58, With Staggered Valve Cover Bolts
3748772    283         58-61
3755537    283          57-62
3755539    283          58-62   Staggered Valve Cover Bolts
3755549    283          57-62
3755550    283          59     Corvette  Staggered Valve Cover Bolts
3755585    327          62-67 G.M.C Truck
3756519    283          57-62
3760116    283          60-64
3767460    283,327   60-64
3767462    327          62-67  161 / 65cc Ports
3767465    283          59-61
3767754    283          59-61 Power Pack Heads
3767792    283          60-64
3770126    327          69
3774682    283, 327  60-64
3774684    327          62-64  Passenger Car and Truck
3774692    283          60-61  Corvette
3774692    283          58-64  Passenger or Power Pack Head
3782461    327          64-66  Double Hump or Camel Hump  161 / 62cc Ports
3782461X  327          60-63  Larger Intake Runners, 172 / 64cc Port (other notes suggest Fuel Injection)
3782870    327          62-37
3789817    327          62-67
3789935    283          57-62
3790721    283          64-67
3792563    327          65-67
3795896    283          63-65  Power Pack Heads
3795896    327          62-64  Corvette 250 HP 140 / 60cc Ports
3798996    327          63-67
3814480    283, 327  60-67
3814482    327, 350  62-67   75cc  Low Compression Heads
3817680    283, 327  63-67
3817681    327, 350  62-67
3817682    283          61-62
3836839    265          55
3836842    283,327   57-67
3837064    265, 283  56-62
3837065    265          55-56 Truck
3837739    283          57
3848720    283          57-58
3849852    283          57-67
3849935    283          65-67
3852174    327          62-64
3854520    283, 327  62-67  140 / 60cc Ports
3870064    265, 283  56-62
3870065    265          55-56  Truck
3876775    283, 327              210 HP Camaro Accessory Bolt Holes on one end only
3884520    283, 327              60cc
3890462    302, 327              350  Camel Hump or Double Hump 161 / 165cc Intake Port
3901068    350                      285HP Crate Engine 64cc, 72º Intake Bolt Angles
3911032    307, 327   68       Without  Accessory  Bolt Holes
3912264    283           58-62
3912265    283           63-64
3912311    327           67
3912313    327          65-67
3917290    307, 327, 67-68  142 / 59cc Ports
3917291    302, 327, 350     Camel Hump or Double Hump 161 / 65cc Ports
3917292    327  350   68       Corvette  Camel Hump or Double Hump
3917293    307, 327              75cc  144 / 58cc Ports
3927185    307, 327              69cc  69-70
3927186    302, 350              Camel Hump or Double Hump 63cc Chamber 161 / 65cc Ports
3927187    350            69-70 Camel Hump or Double Hump 64cc
3927188    307,                      74cc
3928455    302, 327    68
3928494    327, 350    68
3928495    327            68
3931633    307            68-72
3931635    250            68-76
3931637    327            68-69
3931638    327            68         Truck
3932441    350                         76cc  161 / 165cc Intake Port
3932441X    350                       80cc  1.94 / 1.5 Valves  161 / 65cc Port
3932441X    400                       80cc  1.94 / 1.6 Valves  161 / 65cc Intake Port
3932454    307             69
3946812    350             69
3946813    350             69-70  138 / 72cc Ports
3747041    302, 350                 64cc
3951598    400             70        76cc
3964286    350
3970126    327, 350      67-70
3973414    350              70         LT-1  64cc  Camel Hump or Double Hump Heads
3973487    350              71-76
3973487    350                           LT-1  75cc 161 / 165cc Intake Port
3973487X  350                           75cc  Larger Intake Ports
3973493    400              71         76cc
3986316    350              71         Corvette  76cc
3986336X    350                         76cc
3986388    307, 350      68-76
3986339    307, 350      71         75cc
3986339X    307,350                 75cc
3991492    350               70        LT-1   64cc  Straight Plugs Camel Hump or Double Hump
3991492                         70        Straight or Angle Plugs  64cc 157 / 62cc Ports
3998916    350                           LT-1   76cc  Screw in Rocker Arm Studs  
3998920    350               72-73
3998991    307,350        73       75cc Hardened Valve Seats
3998991    307, 350       72-73  75cc   
3998993    307, 350       73       75cc Hardened Valve Seats
3998993    307, 350       72-73  76cc 164/64cc Ports
3998993    350                           Crate Mexico Made 159/64cc Ports
3998993    350,400        73       76cc Hardened Valve Seats
3998997    350, 400       72-73  76cc   
3998997    305, 350                  161 / 165cc Intake Port  Hardened Valve Seats
4079261    350               75
10033867                                  Pontiac Aluminum Racing Heads Angle Plugs 62cc - 196cc Intake Port   23º   2.10 -1.625 Valves
10045434                                  Pontiac Aluminum Racing Heads Angle Plugs 55cc Raised Intake Runner 15º Roll Over
10051101                                  Bow Tie Aluminum Angled Plugs  55cc  Raised Intake Runner 196cc Intake Port
10088113    350             88-93 Corvette Aluminum Angled Plugs  58cc 1.94 -1.5 valve Super Light Weight
10106178    350             90      LT-5 and ZR-1  Dual Over Head Cam  32 Valve Passenger's Side
10106179    350             90      LT-5 and ZR-1  Dual Over Head Cam  32 Valve  Driver's Side
10110810    350             93      Generation I
10128374    350                       Generation II LT-1  53cc  Angled  Plugs Corvette Aluminum  Reverse Flow Cooling System 168-175 cc Intake Port
10134352                                 Bow Tie  Low Port Aluminum with 18º Angled Plugs 45cc  223cc Intake Ports
10134363                                 Bow Tie  High Port  Aluminum  with 18º Angled Plugs 45cc  210cc Intake Ports
10134363                                 Bow Tie  High Port Aluminum with 18º Angled Plugs  60cc 215cc Intake Ports
10134363                                 Bow Tie High Port, Aluminum with 18º Angle Plugs 50cc  250cc Intake Ports CNC Machined  2.15 / 1.625 Valves
10134363                                 Bow Tie High Port  Aluminum 18º  Angle Plugs 65cc 250cc Intake Ports CNC Machined  2.15 / 1.625 Valves
10134363                                 Bow Tie  High Port Aluminum 15º  Angle Plugs  36cc 223cc  Intake Ports
10174389    350             90-95 LT-5 and ZRI  Dual Over Head Cam  32 Valve   Driver's Side
10174390    350             91-95 LT-5  and ZRI Dual Over Head Cam   32 Valve   Passenger's  Side
10185040                                 Symmetrical Port  splayed valve  Aluminum  45cc  263cc Intake Port 1st design
10185040                                 Symmetrical Port  splayed valve  alm, 45cc, 263cc intake port, 2nd. design
10205245    350             93      Generation II  LT-1 Aluminum   Reverse Flow Cooling System 168-175 Intake Port
10207643    350             94-96 Generation II  LT-1 Aluminum   Reverse Flow Cooling System
10225121    350             94-95 LT-1 and ZR1  Dual Over Head Cam 32 Valve  Driver's Side
10225122    350             94-95 LT-1 and ZR1  Dual Over Head Cam 32 Valve  Passenger's Side
10239902    350             96-     Generation II LT-4  Aluminum  Reverse Flow Cooling System
10239906    350                       Vortec 5700   L-31 64cc Heart Shaped Chamber 1.94  / 1.5 170cc Intake Ports
14010201    305             84
14011034                                  Bow Tie  Phase 2  Iron Angle Plugs 64cc 2.02 / 1.6  184cc .080 Taller Intake Ports
14011039    350                        High Performance Replacement  Aluminum
14011049                                  Bow Tie  Phase 6  Aluminum Angled Plugs 55cc 2.02 / 1.6 or 2.1 / 1.65, 180cc Intake Ports
14011083    350                        300 HP Crate Engine 64cc  90º Manifold Bolt with Hardened Valve Seats
14011083    350             87-95  64cc  Center Bolt Valve Covers  72º Manifold Bolt
14014415    267, 305     80-85
14014416    305             80-85  High Output  58cc 1.84 / 1.5 165/59cc Ports
14022601    267, 305     80-85  High Output  58cc 1.84 / 1.5
14022801    305             80-85
14071114    350             80-85
14079261    350             86
14096217    350                       285 HP Crate Engine 1.94 / 1.5, 72º  Intake Bolts  64cc Center Bolt Valve Covers
14101081    305            87-88 Camaro  Center Bolt  Valve Covers
14101083    350                      285 HP  and 300HP  Crate Engine 1.94 / 1.5  72º  Intake Bolts
14101128    350            86-87 Aluminum Corvette   with  Angled Plugs  58cc
14102187    305            87-91 High Output  1.85 / 1.5 58cc
14102191    305            87-95 350 Center Bolt Valve Covers
14102193    305, 350    87-95
24502559                                 Bow Tie  Aluminum  Mirror Ports

More Castings

33417369    350                       Generation I Crate Engine  Mexico Made  76cc 1.94 / 1.5 Flange Valve Cover Heavier Casting
366298                                     Bow Tie, Aluminum Billet Main Caps  3.398" Bore with Sleeves  Two Piece Rear Main Seal
366299                                     Bow Tie  Aluminum Nodular Iron Splayed Main Caps  4.00" Bore
389257        302            67       2 Bolt Main Caps
393288        283            65-67  2 Bolt Main Caps
460703        350            78       4 Bolt Main Caps
460776        305            78-79  2 Bolt Main Caps
460777        305            78-79  2 Bolt Main Caps
460778        305            78-79 2 or 4 Bolt Main Caps Some Canadian Assembled Heavy Duty Truck Blocks Have 4 Bolt Main Caps
471511        267            79-82 2 Bolt Main Caps
3556519     283             58-61 2 Bolt Main Caps
3703524     265             55      2  Bolt Main Caps No Oil Filter (This Casting Design Was Short Lived For Obvious Reasons)
3720991     265             56-57 2  Bolt Main Caps
3731548     265             57      2  Bolt Main Caps No Side Motor Mounts (This Engine Mount Was Attached to the Front)
3731548    283              57      2  Bolt Main Caps No Side Motor Mounts (This Engine Mount was Attached to the Front)
3737739    283             58-64 2  Bolt Main Caps
3756519    283             58-62 2  Bolt Main Caps
3782870    327             62-67 2  Bolt Main Caps
3789817    283             62-64 2  Bolt Main Caps
3789817    327             62-67 2 Bolt Main Caps
3789935    283             61-67 2 Bolt main Caps
3790721    283             62-64 2 Bolt Main Caps  This Engine was Designed for the Chevy II and had a Recessed Oil Filter Boss
3790721    327             65-66 2 Bolt main Caps  This Engine was Designed for the Chevy II and had a Recessed Oil Filter Boss
3791362    327             62-67 2 Bolt Main Caps  This Engine was Designed for the Chevy II  and had a Recessed Oil Filter Boss
3792563    327             65      2 Bolt Main Caps
3792582    283             64-65 2 Bolt Main Caps
3794226    283             58-63 2 Bolt Main Caps
3794460    327             62-64 2 Bolt Main Caps
3830944    327             63      2 Bolt Main Caps
3834810    283             64-66 2 Bolt Main Caps
3834812    283             62-63 2 Bolt Main Caps
3837739    283             58-62 2 Bolt Main Caps
3849852    283             57-66 2 Bolt Main Caps
3849935    283             65-67 2 Bolt Main Caps
3858174    327             64-67 2 Bolt Main Caps
3858180    327             64-67  2 Bolt Main Caps
3858618    350             68-76  2 Bolt Main Caps
3862194    283             65-67  2Bolt Main Caps  This Engine was Designed for the Chevy II and had a Recessed Oil Filter Boss
3862812    283             62-64  2 Bolt Main Caps
3892657    302             67       2 Bolt Main Caps  Camaro Z-28
3892657    327             67       2 Bolt Main Caps
3892657    350             67       2  Bolt Main Caps Camaro
3896944    283             66-67  2 Bolt Main Caps
3896948    283...66-67...2
3903352    327.....67....2
3914636    307.....68....2
3914638    307.....68....2
3914653    307...68-73...2
3914660    327.....68....2
3914678    302.....68....2...Z-28 Camaro
3914678    327.....68....2
3914678    350.....68....2
3931174    307.....68....2...Truck
3932371    307...69-73...2
3932373    307...68-73...2
3932386    302.....69....4...Z-28 Camaro
3932386    327.....69....2
3932386    350.....69....4
3932388    327.....69....2
3932388    350.....69....2 or 4
3933180    327...68-69...2
3951509    400...70-71...4
3951509    400...74-80...2
3951511    400...70-73...4...Some replacement blocks had 2-bolt main caps
3956618    302.....69....4...Z-28 Camaro
3956618    327...68-69...2
3956618    350.....69....2 or 4
3956632    307.....69....2
3959512    327...62-67...2...Was also used for some "CE" replacement blocks
3959532    283...64......2...Used for some "CE" replacement blocks
3959538    327...........2...Chevy II recessed oil filter boss, Used for some Chevy II "CE" replacement blocks
3970010    302.....69....4...Z-28 Camaro
3970010    327.....69....2...Trucks and industrial
3970010    350...69-80...2 or 4
3970014    350...70-76...2 or 4
3970020    307...69-73...2
3970024    307...69-73...2
4715111    305.....80....2
6259425    350...69-76...2
140029      350...80-84...2
330817      400...72-80...2
355909      262.....75....2
355909      305...76-79...2
360851      262...75-76...2...Monza V-8
361979      305...77-79...2 or 4, some Canadian assembled heavy duty  blocks have 4-bolt main caps
366245      350...78-79...4...Bowtie
366286                           4...Bowtie, siamesed straight nodular iron main caps, 2-piece seal, 4.00-4.150" bores, 2.45" main journals
10036033...350...........4...Goodwrench crate motor, 2-piece rear seal, "Hecho en Mexico"
10046164...305.....86....2
10049804.................4...Aluminum, Pontiac Super Duty version of Gen.I SBC, 4.00" bore, 350 mains, 2-piece rear seal, splayed caps, GTP race block
10051182.................2 or 4...Bowtie, 3.75"-4.30" bores, 1 or 2-piece rear seal
10051184.................4...Bowtie, 4.00"-4.155" bores, 1 or 2-piece rear seal
10054727...350...86-up...2 or 4...one piece rear seal, some "Made in Canada"
10066036...350...........2 or 4...Target Master/Goodwrench crate motor, 2-piece rear seal, "Hecho en Mexico"
10066038...350.....92....4...Goodwrench crate motor, 2-piece rear seal, "Hecho en Mexico"
10090511...350.....90....2...LT-5, ZR1 Vette, 375hp
10125327...350...92-up...2 or 4...Gen.II LT-1, reverse flow cooling
10125327...350...96-up...2 or 4...Gen.II LT-4, reverse flow cooling
10134398.................4...Bowtie, Aluminum, 4.125" bore, 2.65" main journals
10134996.................4...Bowtie, Aluminum, 4.125" bore 2.65" main journals
10153558...350...91-92...4...LT-5, ZR1 Vette, 375hp
10168588...265...94-96...2...L99, Gen.II, 4.3 Liter V-8, Caprice, reverse flow cooling
10199001...350...93-95...4...LT-5, ZR1 Vette, 405hp
10243878...305...96-98...2...Vortec truck, roller cam, one-piece rear seal
10243880...350...95-00...2 or 4...Vortec truck, Gen.I crate motors and "ZZ4", roller cam, one piece rear seal
12550592...350...97-up...crossbolted block, Gen.III, "LS1", aluminum
12551358.........99-up...Gen.III, 4.8L or 5.3L, cast iron, truck
12551364...364...98-04...crossbolted cast iron Gen. III, 6.0L, truck
12559378...350...99-up...crossbolted block, Gen.III, "LS1", aluminum
12559846...350...98-up...crossbolted block, Gen.III, "LS1", aluminum
12560621...350...98-up...crossbolted block, Gen.III, "LS1", aluminum
12560626...350...99-up...crossbolted block, Gen.III, "LS1", aluminum
12560629...350...99......crossbolted block, Gen.III, "LS1", aluminum
12561168...350...01-up...crossbolted block, Gen.III, "LS1", aluminum
12562174...350...98-up...crossbolted block, Gen.III, "LS1", aluminum
12568952...364...05-up...crossbolted block, Gen.III, 6.0L, aluminum, LS2
12566910...325...04-up...crossbolted block, Gen.III, 5.3L, aluminum, SSR truck
12571048...325...04-up...crossbolted block, Gen.III, 5.3L
12573581...364...98-04...crossbolted cast iron, Gen.III, 6.0L, truck
12577184...364...98-04...crossbolted cast iron, Gen.III, 6.0L, truck
12577396.........02-up...Gen.III, 4.8L or 5.3L, cast iron, truck
14010201...305...80-85...2
14010202...305...80-85...2
14010203...305...80-85...2
14010207...350...80-85...2 or 4
14010209...350...80-85...2 or 4
14010280...267...79-82...2
14011064...350...83......4
14011148...350...87-89.......Roller cam, one-piece rear seal
14016376...267...79-82...2
14016379...350...77-79...2 or 4
14016381...305...80-84...2
14016382...305...79-84...2
14016383...305...80-85...2...Truck
14079287...350...86-90.......Truck
14088526...350...87-89.......Roller cam, one-piece rear seal
14088548...350...86-88...2 or 4
14088551...305...86-87...2...one-piece rear main seal
14093627...305...87-94...2...Roller or flat tappet cam, one-piece rear seal
14093638...350...87-95...2 or 4...Roller or flat tappet cam, one-piece rear seal
14094766...305...86-up...2...One-piece rear seal
14101147...305...85-up...2
14101148...350...86-90...4...One-piece rear seal
14102058...305...87-91...2...Roller cam, one-piece rear seal
22551656.................4...Rocket block, 4.00"-4.190" bores, 2.45" main journal sizes, splayed caps, dry sump, 2-piece rear seal, 9.025" deck
330545.....73......350..........76cc chamber, 2.02/1.60
333881.....74-75...350..........76cc chamber, 2.02/1.60
333882.....74-80...350/400......76cc chambers
340292.....70's.......Over the counter, angle plug, 64cc chamber
354434.....75-79...262/267/305...60cc chambers
358741.....76-79...305
376445.....77-85...350..........76cc chamber, small valves
376450.....75-81...262/267/305..6 or 7 exhaust bolt holes, 60cc chamber
462614.....77-79...305..........60cc chamber
462624.....75-86...350/400......76cc chamber, 1.72/1.5, 1.94/1.5 or 2.02/1.6 valves
458642.....75-84...350..........350
468642.....76-up...350/400
471513.....79......267/350
517513.....79......267/350
1816887....63......283..........Made in "Canada", GMC HD truck
3636839....55......265
3703523....55......265
3713358....55-56...265
3713569....55-56...265
3725306....56......265
3731539....57......283..........283 HP FI
3731544....57-61...283
3731554....57-62...283
3731556....57......283..........Truck, Made in Canada
3731762....56......265..........Vette, 2x4 carbs
3737775....62-67...283/327
3740997....57......283..........1x4, 2x4 & FI (exc.-283hp)
3743056....58......283
3743096....62-67...327..........GMC Truck
3747363....57-61...283
3747460....59-67...283/327......70cc chambers
3748770....58......283
3748772    58-61...283
3755537    57-62...283
3755539    58-62...283
3755549    57-62...283
3755550    59......283
3755585    62-67...327..........GMC Truck
3767460    59-60...283
3767462    62-67...327
3767465    59-61...283
3767754    59-61...283..........60cc chambers
3767792    60-64...283
3774682    60-64...283/327......70cc chambers
3774684    62-64...327..........75cc chambers
3774692    58-64...283..........60cc chambers
3782461....64-66...327......Camel hump,no accessory holes,160/62cc port volumes,62cc chamber
3782461X...60-63...283/327..Camel hump,no accessory holes,larger 172/64cc port volumes, 62cc chamber
3795896....63-65...283......60cc chamber
3795896....62-64...327......60cc chamber
3798996....63-67...327
3814480....60-67...283/327..70cc chambers, 1.72/1.5 valves
3814482....62-67...283/327/350..75cc chambers
3817680....63-67...283/327
3817681....62-67...327
3817682....61-62...283
3836839....55......265
3836842....57-67...283/327
3837064....56-62...265/283
3837065....55-56...265..........Truck
3848720....57-58...283
3876775....60-67...283/327......75cc chamber
3884520....60-67...283..........Some marked "Made in Canada", 60cc chamber, also used by Studebaker
3884520....62-67...327..........Some marked "Made in Canada", 60cc chamber, also used by Studebaker
3890462....66-67...302/327/350..Camel hump,no accessory holes,64cc chamber
3901068....87-up...350..........Crate motor, 285hp, 64cc chamber
3911032....68......307/327......70cc chamber
3912264....58-62...283
3912265....63-64...283
3912311....65-67...327
3912313....65-67...327
3917290....67-68...307/327
3917291....67-68...302/327/350..Camel hump,no accessory holes,64cc chamber
3917292....68......327/350......Camel hump,64cc chamber
3917293....67-68...307/327......75cc chambers
3927185....69-76...307/327/350..70cc chambers
3927186....69-70...302/350......Camel hump,64cc chambers,accessory holes
3927187....69-70...350..........Camel hump,64cc chambers,accessory holes
3927188....69......327..........74cc chambers
3927188....70......307..........74cc chambers
3931633....68-73...307
3931635....68-76...350
3931638....68......327..........Truck
3932441....69-70...350..........76cc chambers
3932441X...69-70...350/400......80cc chambers
3932454....69-73...307
3932454....69-79...350..........Truck
3946812....69......350
3946813....69-79...350..........Truck
3947040....68......327.........."Right angle" casting identifier, 64cc chambers, good HP head,
used in trucks, no accessory holes
3947041....69-70...302/350......"Right angle" casting identifier, 64cc chamber, accessory holes, good HP head
3947041X...69-70...302/350......"Right angle" casting identifier, 64cc chamber, 165cc intake port, accessory holes, good HP head
3951598....70......400..........76cc chambers
3964286............350
3965742....70......350..........over the counter, angle plug
3970126....67-71...327/350
3973370....69-70...350..........over the counter in US, Canadian 350/300hp production use in Pontiac, 64cc, straight or angle plug
3973414....70......350..........LT1-370hp, Camel hump, 64cc chamber
3973487....71-72...350..........used on 71-72 350 LT1, 75cc chamber
3973487X...71-72...350..........75cc chamber
3973493....71-72...400..........76cc chamber
3986316....71......350..........76cc chamber
3986336....71......350..........76cc chamber
3986336X...71......350..........76cc chamber
3986339....71......307/350......74cc chamber
3986339X...71......307/350......74cc chamber
3986388....68-76...307/350
3991492....70......350..........LT1,Camel hump,accessory holes,64cc, straight plug
3991492....70-up................over the counter,Camel hump,64cc, straight or angle plug
3998916....72......350..........also used w/'72 350 LT1,big valves, screw in studs,76cc chambers
3998920....72-73...350
3998991....72-73...307/350......75cc chambers
3998993....72-73...307/350......75cc chambers
3998993....current..350.........Goodwrench crate motors,"Hecho en Mexico",75cc chambers
3998997....72-73...350/400......76cc chambers
3998997....78-84...305/350......76cc chambers
4079261....75......350
10033867........................Aluminum,over the counter Pontiac 23' head,62cc,angle plug, 196cc intake port
10045434........................Over the counter Pontiac 15' head
55cc, angle plug, raised runner
aluminum, "roll over" head
10051101........................Bowtie, aluminum, 55cc, angle plug
raised runner, 196cc intake port
10065202...87-95...350..........Truck
10065203...87-95...350..........Truck
10065204...87-95...350
10065205...87-95...305
10065206...87-95...350
10065207...87-95...305
10088113...88-up...350..........Aluminum, 58cc, angle plug, raised
"D" port exhaust, 1.94"/1.5" valves
10093328........................Over the counter, Pontiac 15' head
aluminum,224cc ports, 61cc chambers,
"roll over" head
10106178...90......350..........LT5, ZR1, DOHC, 32-valve,
pass. side, aluminum
10106179...90......350..........LT5, ZR1, DOHC, 32-valve,
drvs. side, aluminum
10110810...91-up...350..........Gen. 1, 65cc chambers
10120928...87-95...350
10125320...94-96...350..........Gen.II LT1, cast iron version, used
on "9C1" Police package, Impala SS,
Cadillac Fleetwood, Buick Roadmaster
reverse flow cooling
10128374...92-up...350..........Gen.II LT1, 53cc, angle plug,
aluminum, reverse flow cooling,
175/68cc ports
10134352........................Bowtie, 45cc, angle plug, "low"
port, 223cc intake port, aluminum,
18' race head
10134363........................NOTE:  This casting # has been used
in many different versions of this
aluminum 18' and 15' Bowtie race head.
Different chamber volumes, port
volumes, port locations, valve sizes,
etc. were used.  Check this casting
carefully to determine which features
it may have.  There are at least 6
different versions as of 11/99.
10147898...95-98...350..........Gen.I crate motor
10159550...87-95...350
10159551...87-95...305
10159552...87-95...350
10159553...87-95...305
10174389...91-94...350..........LT5, ZR1, DOHC, 32-valve,
drvs. side, aluminum
10174390...91-95...350..........LT5, ZR1, DOHC, 32-valve,
pass. side, aluminum
10185040........................Bowtie, aluminum, 45cc chambers,
1st version, symmetrical ports,
263cc intake ports, splayed valves
10185040........................Bowtie, aluminum, 45cc chambers,
2nd version, symmetrical ports,
240cc intake ports, splayed valves
10205245...93......350..........Gen.II LT1, aluminum, reverse
flow cooling, 175/68cc port volumes
10207643...94-96...350..........Gen.II LT1, aluminum, reverse
flow cooling, 175/68cc port volumes
10208890...94-96...265..........Gen.II, L99, 4.3 Liter V-8, cast iron, reverse flow
10215339...97......350..........Gen.III, LS1, aluminum, 68cc
10225121...94-95...350..........LT5, ZR1, DOHC, 32-valve,
drvs. side, aluminum
10225122...95......350..........LT5, ZR1, DOHC, 32-valve,
pass. side, aluminum
10239902...96-up...350..........Gen.II LT4, aluminum, reverse
flow cooling, 195cc port, 54.4cc chamber, angle plug
10239906...96-up...350.........."Vortec 5700", "L31", 64cc chamber,
170cc intake port, 1.94"/1.5" valves
12367712...99-up................"Fast Burn", aluminum, 210cc intake,
port, 2.00/1.55 valves, 62cc chamber
12367713...99-up................"Fast Burn" used on ZZ430 crate motor, aluminum, 210cc intake
port, 2.00/1.55 valves, 62cc chamber
12480005...2000.................LS1 "GTZ", aluminum, 38cc, 2.125"/1.625" valves, angle plug
12480011...97-up................Bowtie "SB2.2", aluminum, 2nd
version of "SB2", 48cc chambers,
"mirror ports", revised valve
angles & plug location
12506450...87-95...350
12509859...87-94...305
12516852...87-95...350
12529742...95-96...265..........Gen.II, "L99", cast iron
12551561...96......350..........Gen.II, "LT1", aluminum
12552520...97-up...305..........Vortec, truck
12554290...94-96...350..........Gen.II, "LT1", cast iron version, used
on "9C1" Police package, Impala SS,
Cadillac Fleetwood, Buick Roadmaster
reverse flow cooling
12554291...95-96...265..........Gen.II, "L99", cast iron
12555690...96......350..........Gen.II, "LT4", aluminum
12556743...99......325..........Gen.III, 5.3L, aluminum, truck, van
12558059...97......305..........Vortec, truck, 1.84"/1.5" valves
12558062...98......350..........L31 Vortec, truck, 64cc chambers, 1.94/1.5, 170cc intake port
12558806...97-98...350..........Gen.III, "LS1", aluminum, 68cc
12559853...99-up...350..........Gen.III, "LS1", aluminum, 68cc
12559862...99-00................Gen.III, aluminum 4.8/5.3L
12559895...00-up...325..........Gen.III, aluminum, Vortec 5.3L
12561706...01-04................Gen.III, 5.3L, aluminum
12561873...99-01...364..........Gen.III, 71cc, iron
12562317...01-04...364..........Gen.III, 71cc, aluminum
12564241...00-up...350..........Gen.III, "LS1", aluminum, 68cc
12564243...01-up...350/364......Gen.III, "LS6", "LS2", aluminum
12572035...01-04...364..........Gen.III, 6.0L, aluminum, 71cc
14008856...79-81...267
14010201...82-85...305
14011034........................Bowtie, cast iron, 64cc chambers,
184cc port volume, angle plug,
"Phase II" head
14011049........................Bowtie, aluminum, 55cc chambers,
angle plug, 180cc ports, "Phase 6"
14011083...55-86...350..........Crate motor for years indicated.
285/300hp, 64cc chambers, 1.94"/1.5" valves
14014415...80-85...267/305
14014416...80-86...305..........1.84"/1.5" valves, 58cc chambers
14014440...80......305..........1.84"/1.5" valves
14019821...80-86...350
14019924...79-81...267
14019926...80-86...350
14010516...80-86...350
14020517...80......350
14020555...81......305
14020556...81......350
14022056...85......350
14022206...80......350
14022301...80-86...305
14022601...80-86...267/305......1.72"/1.5" or 1.84"/1.5" valves, 53cc chambers
14022801...80-86...305
14024816...........350..........76cc chambers, 1.94/1.5 valves, Gen.I crate motors
14034806...78-82...267
14034807...78-86...305
14034808...80-86...350
14034808...96-up...350..........76cc chambers, 1.94"/1.5" valves, Gen.I Goodwrench crate motors
14034810...80-86...350..........Truck
14034811...80-86...350..........Truck
14039121...81-86...305..........Truck
14039122...81-86...305..........Truck
14071114...80-86...350
14075381...80-86...350..........Truck
14079261...86......350
14085844...80-86...350..........Truck
14085963...86......350
14088526...........350..........Gen.II, LT1, aluminum
14089119...86-88...350
14094093...86-88...350
14096217...55-86...350    Crate285hp/300hp, 64cc chambers, 72' or 90' center intake manifold bolt angles
14101081...87-95...305
14101083...87-up...350..........Gen.I, also used on crate motors, 285 or 300 hp, 64cc
chambers, 72' center manifold bolt
angles
14101128...86-87...350..........Aluminum, 58cc, angle plug
14102187...87-91...305..........1.84"/1.5" valves
14102191...87-up...350
14102193...87-up...305/350......1.94"/1.5" valves
22542525........................Dart/Olds/Chevy aluminum, 14'or 17' race head.
24502559...96-97................Bowtie, "SB2", 1st version,
"mirror ports", aluminum, 196cc port, CNC version 280cc port, 38cc chamber
25500141........................Buick/Chevy aluminum, 10' race head,
42cc chambers, symmetrical ports,
235cc intake port volumes,
2.1"/1.625" valves
25534351C..04-up................Gen.I Bowtie, cast iron Vortec head, 175/65cc ports, 2.00/1.55 valves, "small port head"
25534371C..04-up................Gen.I Bowtie, cast iron Vortec head, 206/77cc ports, 2.00/1.55 valves, "large port head"
33417369...90-up...350..........Gen.I Goodwrench crate motor,"Hecho en Mexico", 76cc




World Products Cast Iron Heads ( by part numbers )
4351            67cc, 162cc intake port
4350            76cc, 162cc intake port
4205            58cc, 162cc intake port, 305 torquer
4256            67cc, 172cc intake port, torquer
4257            76cc, 172cc intake port, torquer

Trick Flow Twisted Wedge Alm ( by part number )
31400001    64cc, 2.02-1.6, screw in studs, guide plates,185cc intake ports, candid valve angles
31400002    same 01, except with 72º intake bolts for 87-up
31400003    same 01, except with center valve cover bolt, 86- up
31400005    same 01, except 1.440 valve springs
31400006    same 01, except,  with 72º intake bolts, old style valve covers

Edelbrock Alm. Heads
6061    Performer RPM    Bare head, angle plug, 70cc
6063    Performer RPM    Bare head, straight plugs, 70cc
6071    Performer RPM    Same as 6061 exc. complete
6073    Performer RPM    70cc, 170cc intake port, straight plug, complete
6075    Performer    65-up, 70cc, 2.02-1.6, screw in studs, guide plates, heat riser
6085    Performer    87-93, center bolt valve cover, 60cc
6087    Performer     87, center bolt valve cover, 60cc, 165cc intake port
7700    Vr. Jr. Race Heads, Bare, 71cc, 212-267cc port, CNC Machined, 2.08-1.6,
7720    Same as 7700 exc complete

Big Blocks

058        241/86 cc port
063        256/114 cc port
083        243/110cc port
215        256/114cc port
241        252/116cc port
280        256/114cc port
290        256/114cc port
290        262/115cc port small plug head
291        327/120cc port
340        320/120cc port
820        255/114cc port
840        326/120cc port
842        318/112cc port
990        323/127cc port

330864      396-454         70-81     Oval Port
330865      366-427         70-76     Truck HD    Oval Port
336781      454                 73-85      Oval Port
343771      366-454         68-85     Truck HD
343772      366-454         76-84     Truck HD    Oval Port
346236      454                 75-76      Oval Port
353049      400-402         70-76     Oval Port
473328      366                 68-85      Truck HD Oval Port
3732791    348                 58     
3758379    348                 59-61
3759256    348                 58
3767738    348                 59-61
3781147    348                 60-61      Hi Perf
3795586    409                 61           360HP
3814690    409                 62-64      Hi Perf
3819333    348-409        62-65      Truck
3830817    409                 63-65     340 HP
3837731    409                 63           RPO  Z11
3852583    409                 65           400 HP
3856206    396                 65           Oval Port
3856208    396                 65           Corvette 425 HP Sq. Port
3856213    366                 66-82      Oval Port
3856260    396                 68
3872702    396-427        66            Oval Port
3873858    396, 427        66           Sq. Port
3876875    427                 77-85      Truck  Oval Port
3904390    396-427        67            Oval Port
3904391    396-427        67            Sq. Port
3904392    427                 67            Sq. Port  Almuminum  L-88 & L-89
3904393    366                66-68       Truck    Oval Port
3909802    396-427        67            Oval Port
3917215    396-427        68            Oval Port
3917219    366-427        68-85       Truck HD    Oval Port
3919840    396-427        67-69       Sq. Port
3919842    396-427        68-69       L-88 & L-89  Alm
3931063    396-427        68-72       Oval Port
3933148    366-427        68-84     
3933149    427                 68-76      Truck
3946074    454                 69-71      Alm. L-88, ZL-1, LS-6
3964290    400-454        70            Oval Port
3964291    402-454        70            Sq. Port  L-78, LS-6
3965198    396                 68-69      Oval Port
3975950    366-427        68-70       Truck  Oval Port
3986133    366-427        68-85       Truck  Oval Port
3986136    366-427        68-84       Truck  Oval Port
3993820    400-454        71-72       Oval Port
3994026    454                 71            LS-6    Sq. port
3999241    402-454         72           Oval Port
6272292    402-454         70-75      Oval Port
14092359    427                86-88     Truck Oval Port
14092360    454                85-88     Truck   Oval Port        
Cyclinder Head Castings Information
A Great Resource for Chevrolet Owners
We have a set of 461X Heads
For Sale  
$800.00
Complete and off a running Motor

461heads@chevellebigblock.com
for Cylinder head Information and other codes click here