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. 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.
The block casting date indicates when the block itself was cast in the foundry. This date does not indicate when the motor was assembled and then later placed into the vehicle at the factory. The block casting date is usually found on the rear ledge of the block on the passenger side, but some later model blocks have the casting date on the driver's side of the rear ledge.
Some of the early big blocks made in the Sixties have the block casting date located on the passenger side of the block near the freeze plug holes.
On these, if the early big block is in the car you will have to get under the motor to see the casting date.
Do it while the car is on a lift. The casting dates look something like this "E 12 7". The "E" stands for the month of the year with "A" being the month of January, "B" being the month of February and so on thru the letters to December. In this case the "E" stands for the month of May, the fifth month of the year and the fifth letter of the alphabet. The "12" stands for the 12th day of the month. The "7" is the year of the decade.
Now unfortunately this could be '57, '67, '77, '87 or '97 depending on which part you are looking at. Some casting dates have both the year of the decade and the decade itself. But numbers correct is not numbers matching.
Again, it either matches or it doesn't. If it doesn't match - is it correct? Numbers matching is important when you're trying to decode a Z28 or Super Sport where the VIN won't identify the vehicle as such. You need to decode the engine and see if it matches the vehicle, and if the code signifies Z28 or SS equipment. Lastly, in extreme cases, you'll want to verify the numbers stamped onto the component were the ones stamped into it originally and aren't restamped.
The point of this article is to help you figure out how to decode stuff. Engine Code Stamping Numbers All engines are stamped with an engine ID code, consisting of assembly plant code, production date and suffix code. V8 codes are stamped on a pad just forward of the right side passenger cylinder head. This refers to the date that the engine was cast. The first two numbers are the month, and the last two are the day. For example, if the numbers read , then the engine was cast on January 7.
A and are identical externally….. All small block chevy generation 1 balancers are interchangeable anyways except the small block and the vortec engines of and later. Everything from the waterpump, pulleys, steering pump, alternator brackets will swap right to the if you leave the balancer on the engine.
All harmonic balancers ARE interchangable but you may need to get the right pulley for the power steering. Some had a rubber mount old style.
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