Chevy Block Casting Number

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Chevy Block Casting Number

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Chevy Block Casting Number
Big Blocks
348-409
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There is a lot of misinformation on the internet about these numbers. We have taken the time to verify the data as much as possible. There still may be errors. Please lets us know if you find one.

Chevy Small and Big Block Casting Numbers and Data

Small Blocks

Number	C.I.D.	M-Blts	Year	HP	Description
140029	350	2	80-84
330817	400	2	72-80	150-180	3 freeze plugs
355909	262	2	75		Nova, Monza
355909	305	2	76-79
360851	262	2	75-76		Monza V-8
361979	305	2 or 4	77-79		Some Canadian HD blocks have 4 bolt mains.
366245	350	4	78-79		Dipstick in oil pan, Bowtie High Tin
366286		4			Bowtie, Alu., Siamesed, Str. Nod. Iron Caps, 2 pc. seal, 4.00-4.150 Bores, 2.45 Mains
366287		4			Bowtie, Alu., Siamesed, Str. Nod. Iron Caps, 2 pc. seal, 4.00-4.150 Bores, 2.45 Mains
366298		4			Bowtie, Alu., Billet Caps, 2 pc. seal, 3.398 Bore with sleeves
366299		4			Bowtie, Alm, 4.00 Bore, Nod. Iron Splayed Caps, Wet Sump
376450	350	4	78	175-220
389257	302	2	67
393288	283	2	65-67
460703	350	4	78	175-220
460776	305	2	78-79
460777	305	2	78-79
460778	305	2 or 4	78-79		Some Canadian HD blocks have 4 bolt mains.
471511	267	2	79-82
3556519	283	2	58-61
3703524	265	2	55	195	No Oil Filter, Vett
3720991	265	2	56-57	210-240	Vett
3731548	265	2	57		No Side Motor Mounts
3731548	283	2	57	220-283	No Side Motor Mounts, Vett
3737739	283	2	58-64	170-290	220-290 HP Vett
3756519	283	2	58-62	170-315	Passenger, Vett
3782870	327	2	62-67	250-375	Passenger, Chevelle, Vett
3789817	283	2	62-64
3789817	327	2	62-67		Truck
3789935	283	2	61-64	170-315	Passenger, Vett
3790721	283	2	62-64	170-220	Chevy II, Recess Oil Filter Boss
3790721	327	2	65-66	250-350	Chevy II, Recess Oil Filter Boss
3791362	327	2	62-67	250-350	Chevy II, Recess Oil Filter Boss
3792563	327	2	65
3792582	283	2	64-65
3794226	283	2	58-63	170-195	Passenger
3794460	327	2	62-64
3814660	327	2	68-69
3830944	327	2	63	300
3834810	283	2	64-66	195-200	Passenger, Chevelle, Truck
3834812	283	2	62-63	170-195	Passenger, Commercial Truck
3837739	283	2	58-62
3849852	283	2	57-66		Truck, Passenger, Chevelle
3849935	283	2	65-67
3852174	327	2	62-64
3858174	327	2	64-67	275-350	Passenger, Chevelle, Vett, Trucks
3858180	327	2	64-67	250-375	Passenger, Chevelle, Vett
3858618	350	2	68-76
3862194	283	2	65-67	195-220	Chevy II Recess Oil Filter Boss
3862812	283	2	62-64
3892657	302	2	67	290	Z-28 Camaro
3892657	327	2	67	210-350	Passenger, Chevelle, Vett, Camaro
3892657	350	2	67	295	Camaro
3896944	283	2	66-67	195	Passenger, Chevelle
3896948	283	2	66-67
3903352	327	2	67	210-350	Passenger, Chevelle, Vett, Camaro
3914636	307	2	68	200	Truck, Passenger, Chevelle, Chevy II
3914638	307	2	68
3914653	307	2	68-73
3914660	327	2	68	210-300	Passenger, Chevelle, Chevy II, Camaro, Vett
3914678	302	2	68	290	Z-28 Camaro
3914678	327	2	68	210-350	Passenger, Chevelle, Chevy II, Camaro, Vett
3914678	350	2	68	295	Chevy II, Camaro
3931174	307	2	68	200	Truck
3932338	283	2	62-67
3932371	307	2	69-73
3932373	307	2	68-73
3932386	302	4	69	290	Z-28 Camaro
3932386	327	2	69
3932386	350	2 or 4	69	300-350	Passenger, Chevelle, Chevy II, Camaro, Vett
3932388	350	2 or 4	69
3932388	327	2	69	290
3933180	327	2	68-69
3951509	400	4	70-71	150-265
3951509	400	2	74-80
3951511	400	2 or 4	70-73	255-265
3956618	302	4	69	290	Z-28 Camaro
3956618	327	2	68-69	235	Passenger
3956618	350	2 or 4	69	250-350	Passenger, Chevelle, Chevy II, Vett, Camaro
3956632	307	2	69	200	Truck, Chevelle, Chevy II, Camaro
3959512	327	2	62-67
3959532	283	2	64
3959538	327	2			Chevy II, Recessed Oil Filter Boss
3970010	302	4	69	290	Z-28 Camaro
3970010	327	2	69		Truck
3970010	350	2 or 4	69-80		Truck
3970014	350	2 or 4	70-76	200-255
3970020	307	2	69-73
3970024	307	2	69-73
3970041	327	2	65-67
4715511	305	2	80
6259425	350	2	69-76
10036033	350	4			Crate Motor, 2 pc.seal, Hecho En Mexico
10046164	305	2	86
10049804		4			Alum. Pontiac Super Duty version of Gen.1, 4.00" Bore
10051182		2 or 4			Bowtie, Non-siamesed, 3.75-4.30 Bores, 1 or 2 pc. seals
10051184	350	4	86+		Bowtie, Siamesed, 4.00-4.160 Bore
10054727	350	2 or 4	86+		Made in Canada, 1 pc. seal
10066036	350	2 or 4	86+		Crate Motor, 2 pc. seal, Hecho En Mexico
10066038	350	4	92		Crate Motor, 2 pc. seal, Hecho En Mexico
10090511	350	2	90	375	LT-5, ZR1 Vett
10125327	350	2 or 4	92-96	300+	Gen. II, LT1, Reverse Flow Cooling
10125327	350	2 or 4	96+	300+	Gen. II, LT4, Reverse Flow Cooling
10134398		4			Bowtie, Alm., 4.125 Bore, 2.65 Mains
10134996		4			Bowtie, Alm., 4.125 Bore, 2.65 Mains
10153558	350	4	91-92	375	LT5, ZR1 Vett
10168588	265	2	94-96		L99, Gen II, 4.3 V-8, Caprice, Reverse Flow
10199001	350	4	93-95	405	LT5, ZR1 Vett
10243878	305	2	96-98		Vortec Truck, Roller Cam, 1 pc. seal
10243880	350	2 or 4	95-00		Gen I Crate Motor ZZ4, Roller Cam, 1 pc. seal
12550592	350		97-99	345	Crossbolted Block, Gen III, LS1, Alum.
12551358			99+		Gen.III, 4.8L or 5.3L, Truck, Iron
12551364	364		98-04		Crossbolted Block, Gen III, 6.0L, Truck, Iron
12559378	350		98-00	345	Crossbolted Block, Gen III, LS1, Alum.
12559846	350		98-99	345	Crossbolted Block, Gen III, LS1, Alum.
12560621	350		98+	345	Crossbolted Block, Gen III, LS1, Alum.
12560626	350		98-00	345	Crossbolted Block, Gen III, LS1, Alum.
12560629	350		99		Crossbolted Block, Gen III, LS1, Alum.
12561168	350		01-04	350-405	Crossbolted Block, Gen III, LS1, Alum.
12562174	350		98+	345	Crossbolted Block, Gen III, LS1, Alum.
12566910	325		04+		Crossbolted Block, Gen.III, SSR Truck, 5.3L, Alum.
12568952	364		05+	400	Crossbolted Block, Gen.III, LS2, 6.0L, Alum.
12571048	325		04+	400	Crossbolted Block, Gen.III, 5.3L
12573581	364		98-04		Crossbolted Block, Gen.III, Truck, 6.0L, Iron
12577184	364		98-04		Crossbolted Block, Gen.III, Truck, 6.0L, Iron
12577396			02+		Gen.III, Truck, 4.8L or 5.3L, Iron
14010201	305	2	80-85
14010202	305	2	80-85
14010203	305	2	80-85
14010207	350	2 or 4	80-85	190+	Vett
14010209	350	2 or 4	80-85
14010280	267	2	79-82
14011064	350	4	83		High Tin
14011148	350		87-89		Roller Cam, 1 pc. seal
14016376	267	2	79-82
14016379	350	2 or 4	77-79	225 max.
14016381	305	2	80-84
14016382	305	2	79-84
14016383	305	2	80-85		Truck
14079287	350		86-90		Truck
14088526	350		87-89		Roller Cam, 1 pc. seal
14088548	350	2 or 4	86-88	205+	Flat Tappet, 1 pc. seal
14088551	305	2	86-87		Flat Tappet, 1 pc. seal
14093627	305	2	87-94		Roller or Flat Cam, 1 pc. seal
14093638	350	2 or 4	87-95		Roller or Flat, 1 pc. seal
14094766	305	2	86+		1 pc. seal
14101147	305	2	85+
14101148	350	2 or 4	86-90	205	1 pc. seal, Roller Cam, Non-LT1
14102058	305	2	87-91		Roller Cam, 1 pc. seal
14316379	350		78-81		1 and 2 pc. seals
22551656		4			Rocket Block, 4.00-4.190 Bores, 2.45 Mains, Splayed Caps, Dry Sump, 2 pc. seal, 9,025" Deck
22551660		4			Rocket Block, 4.00-4.190 Bores, 400 Mains, 9.30" Deck, 2 pc. seal

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