.

Casting #CIDYearMainsNotes

.

14002935080 - 842

.

33081740072 - 802

.

355909262752

.

35590930576 - 79 2

.

36085126275 - 762Monza

.

36197930577 - 792 or 4Some Canadian assembled heavy duty blocks have 4-bolt main caps

.

36624535078 - 794Bowtie Block

.

3662864Bowties, siamesed straight nodular iron mains, 2-piece seal, 4.00-4.150" bores, 2.45" main journals

.

3662984Bowtie, Aluminum, billet main caps, 3.398" bore with sleeves, two piece rear main seal.

.

3662994Bowtie, Aluminum, nodular iron splayed caps, wet sump, 4.00" bore

.

389257302672

.

39328828365 - 672

.

460703350784

.

46077630578 - 792

.

46077730578 - 792

.

46077830578 - 792 or 4Some Canadian assembled heavy duty truck blocks have 4-bolt main caps

.

47151126779 - 822

.

355651928358 - 612

.

3703524265552No oil filter

.

372099126556 - 572

.

3731548265572No side motor mounts

.

3731548283572No side motor mounts

.

373773928358 - 642

.

375651928358 - 622

.

378287032762 - 672

.

378981728362 - 642

.

378981732762 - 672

.

378993528361 - 642

.

379072128362 - 642Chevy II recessed oil filter boss

.

37907232765 - 662Chevy II recessed oil filter boss

.

37913632762 - 672Chevy II recessed oil filter boss

.

379258228364 - 652

.

379422628358 - 632

.

379446032762 - 642

.

3830944327632

.

383481028364 - 662

.

383481228362 - 632

.

383773928358 - 622

.

384985228357 - 662

.

384993528365 - 672

.

385817432764 - 672

.

385818032764 - 672

.

385861835068 - 762

.

386219428365 - 672Chevy II recessed oil filter boss

.

386281228362 - 642

.

3892657302672Z-28 Camaro

.

3892657327672

.

3892657350672Camaro

.

389694428366 - 672

.

389694828366 - 672

.

3903352327672

.

3914636307682

.

3914638307682

.

391465330768 - 732

.

3914660327682

.

3932386302694Z28 Camaro

.

3932386327692

.

3932386350692 or 4

.

3932388350692

.

3932388350692 or 4

.

393318032768 - 692

.

395150940070 - 714

.

395150940074 - 802

.

395151140070 - 734Some replacement blocks had 2-bolt main caps

.

3956618302694Z28 Camaro

.

395661832768 - 692

.

3956618350692 or 4

.

3956632307692

.

395951232762 - 672Was also used for some "CE" replacement blocks

.

3959532283642Used for some "CE" replacement blocks

.

39595383272Chevy II recessed oil filter boss, Used for some Chevy II "CE" replacement block

.

3970010302694Z-28 Camaro

.

3970010327392Trucks and industrial

.

397001035069 - 802 or 4

.

397001435070 - 762 or 4

.

397002030769 - 732

.

397002430769 - 732

.

471511130569 - 762

.

100360333504Goodwrench crate motor, 2-piece rear seal, made in Mexico

.

10046164305862

.

100498044Aluminum, Pontiac Super Duty version of Gen.I SBC, 4.00" bore, 350 mains, 2-piece rear seal, splayed caps, GTP race block

.

100511822 or 4Bowtie, 3.75"-4.30" bores, 1 or 2-piece rear seal

.

100511844Bowtie, 4.00"-4.155" bores, 1 or 2-piece rear se

.

1005472735086 - up2 or 4One piece rear seal, some "Made in Canada

.

100660363502 or 4Target Master/Goodwrench crate motor, 2-piece rear seal, Made in Mexico

.

10066038350924Goodwrench crate motor, 2-piece rear seal, "Hecho en

.

10090511350902LT-5, ZR1 Vette, 375hp

.

1012532735092 - up2 or 4Gen.II LT-1, reverse flow cooling

.

1012532735096 - up2 or 4Gen.II LT-4, reverse flow cooling

.

101343984Bowtie, Aluminum, 4.125" bore, 2.65" main journals

.

101349964Bowtie, Aluminum, 4.125" bore 2.65" main journal

.

1015355835091 - 924LT-5, ZR1 Vette, 375hp

.

1016858826294 - 962L99, Gen.II, 4.3 Liter V-8, Caprice, reverse flow cooling

.

1019900135093 - 954LT-5, ZR1 Vette, 405hp

.

1024387830596 - 982Vortec truck, roller cam, one-piece rear seal

.

1024388035095 - 002 or 4Vortec truck, Gen.I crate motors and "ZZ4", roller cam, one piece rear sea

.

1255059235097 - upcrossbolted Gen.III, "LS1", aluminum

.

1255135899 - upGen.III, 4.8L or 5.3L, cast iron, truck

.

1255136436498 - 04crossbolted cast iron Gen. III, 6.0L, truck

.

1255937835099 - upcrossbolted Gen.III, "LS1", aluminum

.

1255984635098 - upcrossbolted Gen.III, "LS1", aluminum

.

1256062135099 - upcrossbolted Gen.III, "LS1", aluminum

.

1256062635099 - upcrossbolted Gen.III, "LS1", aluminum

.

1256062935099crossbolted Gen.III, "LS1", aluminum

.

1256116835001 - upcrossbolted Gen.III, "LS1", aluminum

.

1256217435098 - upcrossbolted Gen.III, "LS1", aluminum

.

1256895236405 - upcrossboltedGen.III, 6.0L, aluminum, LS2

.

1256691032504 - upcrossbolted Gen.III, 5.3L, aluminum, SSR truck

.

1257104832504 - upcrossbolted Gen.III, 5.3L

.

1257358136498 - 04crossbolted Gen.III, 6.0L, truck

.

1257718436498 - 04crossbolted Gen.III, 6.0L, truck

.

1257739602 - upGen.III, 4.8L or 5.3L, cast iron, truck

.

1401020130580 - 852

.

1401020230580 - 852

.

1401020330580 - 852

.

1401020735080 - 852 or 4

.

1401020935080 - 852 or 4

.

1401028026779 - 822

.

14011064350834

.

1401114835087 - 89Roller cam, one-piece rear seal

.

1401637626779 - 822

.

1401637935077 - 792 or 4

.

1401638130580 - 842

.

1401638230579 - 842

.

1401638330580 - 852Truck

.

1407928735086 - 90Truck

.

1408852635087 - 89Roller cam, one-piece rear seal

.

1408854835086 - 882 or 4

.

1408855130586 - 872One-piece rear main seal

.

1409362730587 - 942Roller or flat tappet cam, one-piece rear seal

.

1409363835087 - 952 or 4Roller or flat tappet cam, one-piece rear seal

.

1409476630586 - up2One-piece rear seal

.

1410114730585 - up2

.

1410114835086 - 904One-piece rear seal

.

1410205830587 - 912Roller cam, one-piece rear seal

.

225516564Chevy/Olds Rocket block, 4.00"-4.190" bores, 2.45" main journal sizes, splayed caps, dry sump,
2-piece rear seal, 9.025" deck

.

225516604Chevy/Olds Rocket block, 4.00"-4.190" bores, 400 mains journal sizes, splayed steel caps, wet sump, raised cam
2-piece rear seal, 9.300" deck