The Chevy small block casting date would help you narrow down which the block was cast if use of the casting number spanned decades, such as the late 60's through the early 70's. Some casting numbers were used for several different models so when in doubt you will need to lookup the suffix code stamped into the engine. This number will indicate some notable design specs such as 2 or 4 bolt main bearing caps, what models of cars it was installed in, the years it was installed in those cars, and in some cases the horse power rating.
The Chevy small block engine casting number can be found on the bell housing section of the block just behind the passenger side cylinder head. To know for sure you would need to lookup the casting numbers. You are looking for an engine core for your classic car restoration project and you run across a 65 Impala SS with an engine in it. You are spending the day at a "U-Pick" junk yard.There is a set of camel hump heads he says are off a 327 that "came out of a Corvette." Or … you are at a swap meet and a guy has a few engine parts he's selling.You are looking at a 66 Chevelle that someone has for sale and want to know if it has the correct engine.You would use an engine casting number decoder book in a few scenarios. You can use Chevy small block casting numbers to ensure the accuracy of parts on your classic car restoration, or if you are car hunting, to ensure you are getting what you are paying for. They are used to identify the series of engine castings designed for a specific model of car. Small block Chevy casting numbers are engine series numbers cast into the engine block, cylinder heads, intake and exhaust manifolds.