NADR Racing

Chevy Block Casting Numbers

CASTING#	SIZE	YEAR	MAIN CAP BOLTS	NOTES
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
366298			4	Bowtie, Aluminum, billet main caps, 3.398" bore with sleeves, two piece rear main seal.
366299			4	Bowtie, Aluminum, nodular iron splayed caps, wet sump, 4.00" bore
389257	302	67	2
393288	283	65-67	2
460703	350	78	4
460776	305	78-79	2
460777	305	78-79	2
460778	305	78-79	2 or 4	some Canadian assembled heavy duty truck blocks have 4-bolt main caps
471511	267	79-82	2
3556519	283	58-61	2
3703524	265	55	2	No oil filter
3720991	265	56-57	2
3731548	265	57	2	No side motor mounts
3731548	283	57	2	No side motor mounts
3737739	283	58-64	2
3756519	283	58-62	2
3782870	327	62-67	2
3789817	283	62-64	2
3789817	327	62-67	2
3789935	283	61-64	2
3790721	283	62-64	2	Chevy II recessed oil filter boss
3790721	327	65-66	2	Chevy II recessed oil filter boss
3791362	327	62-67	2	Chevy II recessed oil filter boss
3792563	327	65	2
3792582	283	64-65	2
3794226	283	58-63	2
3794460	327	62-64	2
3830944	327	63	2
3834810	283	64-66	2
3834812	283	62-63	2
3837739	283	58-62	2
3849852	283	57-66	2
3849935	283	65-67	2
3858174	327	64-67	2
3858180	327	64-67	2
3858618	350	68-76	2
3862194	283	65-67	2	Chevy II recessed oil filter boss
3862812	283	62-64	2
3892657	302	67	2	Z-28 Camaro
3892657	327	67	2
3892657	350	67	2	Camaro
3896944	283	66-67
3896948	283	66-67
3903352	327	67
3914636	307	68
3914638	307	68
3914653	307	68-73
3914660	327	68
3914678	302	68	Z-28 Camaro
3914678	327	68
3914678	350	68
3931174	307	68	Truck
3932371	307	69-73
3932373	307	68-73
3932386	302	69	Z-28 Camaro
3932386	327	69
3932386	350	69	2 or 4
3932388	327	69
3932388	350	69	2 or 4
3933180	327	68-69
3951509	400	70-71	4
3951509	400	74-80	2
3951511	400	70-73	Some replacement blocks had 2-bolt main caps
3956618	302	69	Z-28 Camaro
3956618	327	68-69
3956618	350	69	2 or 4
3956632	307	69
3959512	327	62-67	Was also used for some "CE" replacement blocks
3959532	283	64	Used for some "CE" replacement blocks
3959538	327		Chevy II recessed oil filter boss, Used for some Chevy II "CE" replacement blocks
3970010	302	69	Z-28 Camaro
3970010	327	69	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
10036033	350		4	Goodwrench crate motor, 2-piece rear seal, "Hecho en Mexico"
10046164	305	86 and up	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	Aluminum	crossbolted block, Gen.III, "LS1"
12568952	364	05-up	Aluminum	crossbolted block, Gen.III, 6.0L, LS2
12566910	325	04-up	Aluminum	crossbolted block, Gen.III, 5.3L, SSR truck
12571048	325	04-up		crossbolted block, Gen.III, 5.3L
12573581	364	98-04	Cast Iron	crossbolted cast iron, Gen.III, 6.0L, truck
12577184	364	98-04	Cast Iron	crossbolted cast iron, Gen.III, 6.0L, truck
12577396		02-up	Cast Iron	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
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	Chevy/Olds Rocket block, 4.00"-4.190" bores, 2.45" main journal sizes, splayed caps, dry sump, 2-piece rear seal, 9.025" deck
22551660			4	Chevy/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