4 Small/Big-Block Date Code: Explained and Decoded.
3 Small/Big-Block Casting Number: Explained. 1 GM/Chevy Small/Big-Block Engine Serial Number. Note: For the year, more info is needed as the 7 can mean 67, 77, 87, or 97. On the driver side ledge (on some later blocks) On the passenger side of the block near the freeze plug (in some earlier production blocks from the 60s) or At the back ledge of the block behind the passenger side cylinder head, next to cylinder #8 or Notes: Car & Truck, 2-bolt, Passenger stick 1-piece seal On the passenger side ledge, next to cylinder #8 (on some later production blocks) At the back ledge of the block behind the driver-side cylinder head, next to cylinder #7 or Last 6 Digits = Equal the last 6 digits of the vehicle’s VIN.Ġ12345 = The last six digits of the vehicle's VIN At the front passenger side of the block, next to cylinder #2 or - On the flat block just above the timing cover (in some truck or marine blocks) On the flat block just above the timing cover (in some trucks or marine blocks)Ģnd and 3rd digits = month of the assembly Ĥth and 5th digits = day of the assembly 
At the front passenger side of the block, next to cylinder #2 or
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