This match is done via the PARTIAL VIN stamp on the component.Some folks use these terms loosely, or will say numbers correct or something to that effect.
If it doesnt match - is it correct Numbers matching is important when youre trying to decode a Z28 or Super Sport where the VIN wont 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, youll want to verify the numbers stamped onto the component were the ones stamped into it originally and arent restamped. The point of this page is to help you figure out how to decode stuff. V8 codes are stamped on a pad just forward of the right side (passenger) cylinder head. In some cases suffix codes are reused twice or more over time, in this event check the partial VIN code or block casting date code and then see what year the block was made to pin down what application your block was originally used in. This list of codes is a summarization, it is not complete nor all inclusive. It represents any CID and is used to indicate this particular engine was replaced under Warranty. Another example: A Targetmaster engine (pn 14009800) built in 1985 could have a code stamped as follows: A0198005 (A january, 01, 9800 pn, 5 1985). Chevy Small Block Intake Casting Numbers Serial Or SequenceThe format consists of divisional identification number, model year, assembly plant designation and vehicle serial or sequence number. In 68-69 model cars, the serial (VIN) number of the car the engine was installed in is stamped next to, or under the engine code ID. Chevy Small Block Intake Casting Numbers Serial Number Is StampedStarting in 1970, the serial number is stamped either above the oil filter, somewhere on the block pad (in front of the cylinder head), or on the transmission flange somewhere. Chevrolet issued technical service bulletins to indicate which engines were to recieve a vin stamp, so who knows what could have happend (or not happened). The clock is a circle of 10 dots, one dot for each hour of a shift (usually 10 hour shifts). An arrow points to the beginning of the shift an another dot outside the circle indicates what time of day the cast part was made. Anyways, thats what that circle thing is (if you happen to see it on something). 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. However, a properly prepared 2 bolt main engine will work just fine (often times youll lose a rod bolt before you break a crank because its only a 2 bolt main).
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