In model cars, the serial VIN number of the car the engine was installed in is stamped next to, or under the engine code ID. Starting in , 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.
In , plant codes changed to reflect the VIN code. In and on, it was simply "N". Casting Clock On some Saginaw blocks, intakes and exhausts a "clock" was cast into the block. 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, that's what that circle thing is if you happen to see it on something. Casting Date Small block casting date is located on driver side rear of block on flange forward of bellhousing.
Big block on the right side of engine above the oil pan rails. A "two-bolt" main, or a four-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.
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. Casting Date. Read the next four digits in the code, which will be all numbers. 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. Your serial number is located on your engine plate , often located on the left-hand side of the engine. Typically the first letters and numbers will identify the engine, for example, DJ, to find all the parts we have online for your engine.
If a manual is unavailable, locate the block casting number beside the block date number. The prefix code is identified by the first few letters. The plant where the Chevy big block engine was manufactured is the first character. The following numbers are the day, followed by the month. The engine serial number is on a metal plate attached to the block, typically found on the left-hand side of the engine.
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. It is a direct replacement for the original equipment. It doesn't indicate what the original equipment was. VF - is an example of a over the counter crate engine. The final digit could be a year code. Here's something secret I've been working on since If it does - it's "numbers matching", otherwise - it's not.
Some folks use these terms loosely, or will say "numbers correct" or something to that effect. 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.
What good is knowing the transmission? Good news is Hey man - is this a 4 bolt main? I have no idea It can be done on any or other block.
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