![]() The casting date may be near the casting clock, which designates the hour the block was cast. The example 2.25.93 decodes as February 25, 1993. It is in standard date coding, 2.25.93, for example and may be located on either side of the block, but is commonly located on the driver's side of the block, above the freeze plugs. Locate the casting date is located on the block. These are change codes and are not normally necessary to identify the engine. The seven-digit number may be followed with a dash and further numbers. The digits can be located on either side of the block. The numbers are raised, not stamped into the block and consist of seven numeric digits. Search the block for the engine block casting number. The top line of the tag identifies engine size and model year. Attached at the factory, this tag is normally found on the engine block around the coil bolts. otherwise 2 or 4 bolt can mean either design.Find the engine identification tag. In 1968 the main bearing saddles were increased in size from 2.3' to 2.45'. General Engine Block Specifications While 6 different bore size blocks have been produced, the small block engine can be classified into 3 bore sizes and 3 main bearing sizes. However, a properly prepared 2 bolt main engine will work just fine (often times you'll lose a rod bolt before you break a crank because it's 'only' a 2 bolt main). Four bolt main blocks are desirable in high performance applications because the extra strength of the additional bolts keeps the bottom end rigid and less prone to failure. 'Main Caps' is the number of bolts holding the cap. Notes (for below): 'High Power' is the maximum rate HP this block was used for, 'Low Power' is the lowest rated horsepower RPO engine the block was used in. The point of this page is to help you figure out how to decode stuff. ![]() ![]() 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. You need to decode the engine and see if it matches the vehicle, and if the code signifies Z28 or SS equipment. 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. But numbers correct is not numbers matching. Some folks use these terms loosely, or will say 'numbers correct' or something to that effect. If it does - it's 'numbers matching', otherwise - it's not. ![]() The partial VIN will match the vehicles VIN. This match is done via the PARTIAL VIN stamp on the component. When people say 'It's numbers matching' - what they mean is the engine (or other component, i.e the transmission) can be MATCHED to the vehicle it was originally used in. This is my opinion, and the generally accepted norm: ![]()
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