SBC Block Common Casting Numbers

Standard

The block casting number on small block and big block Chevy V-8 motors is located on a ledge found at the rear of the block, most often on the driver’s side. This ledge is below the deck of the block and the ledge forms the mating surface between the block and the transmission bell housing. Some of the later model blocks have the casting number on the passenger side of this ledge. The number itself can have 6, 7 or 8 numeral digits. They might look like this 361959 or 3970010 or 14015445. The block casting numbers do not have any letters in them. There are sometimes individual letters found on blocks like GM or CFD for the Central Foundry Division, but they are not part of the block casting number. Also some of the later blocks have the size of the motor shown in liters. You may see a 5.0 (305) or 5.7 (350) cast on the rear ledge of a small block or a 7.4 on the side of a big block 454. On the side of some later blocks the last three digits of the block casting number are cast into the block, but these are difficult to see when the engine is in a vehicle.

These are some of the more common head numbers.

Casting Number CID Years Notes
140029 350 80 – 84 2 bolt main bearings
330817 400 70 – 76 2 bolt main bearings, car & Truck
355909 262 75 2 bolt main bearings
355909 305 76 – 79 2 bolt main bearings
3970010 302 69 Camaro Z/28 – 4
bolt main bearings
3970010 327 69 2 bolt main bearings – trucks
3970010 350 69 – 80 2 or 4 bolt main bearings
3970014 350 70 – 76 2 or 4 bolt main bearings
3970020 307 70 – 73 2 bolt main bearings
3970024 307 69 – 73 2 bolt main bearings
4715111 305 80 2
bolt main bearings
6259425 350 69 – 76 2
bolt main bearings
14010201 305 80 – 85 2
bolt main bearings
14010202 305 80 – 85 2
bolt main bearings
14010203 305 80 – 85 2
bolt main bearings
14010207 350 80 – 85 2 or 4
bolt main bearings
14010209 350 80 – 85 2 or 4
bolt main bearings
14010280 267 79 – 82 2
bolt main bearings
14011064 350 83 4 bolt main bearings
14011148 350 87 – 89 Roller Camshaft, 1 piece rear
main seal
14016376 267 79 – 82 2
bolt main bearings
14016379 350 77 – 79 2 or 4
bolt main bearings
14016381 305 80 – 84 2
bolt main bearings
14016382 305 79 – 84 2
bolt main bearings
14016383 305 80 – 85 2
bolt main bearings, Truck
14079287 350 86 – 90 Truck
14101147 305 85 – ? 2
bolt main bearings
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