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Old 08-21-2008, 04:03 PM
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letters on chevy small block oil pan rail

Well i was scraping remains from old gaskets off a 350 block i have and noticed letters on the oil pan rail after i removed the gasket. one side there is 4 letter J, in between each bolt hole, the other side has a K, J, and 2 H. i was just curious if anyone knew what those indicated.

-thanks

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Old 08-21-2008, 06:42 PM
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If you were to look at the pistons that were in the bore directly above that rail letter, you would see that it would have the same letter stamped into the top.

Every bore is different size and to make up the difference. The pistons are graded for fit. A "C" piston in a "C" hole. An "H" piston in an "H" hole, etc.

The pistons are selective fit. Placed into a rack that travels to the block and then installed while going down the production line.
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Old 08-21-2008, 07:31 PM
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ooo ok now that makes sense. i see now, i dont know why i couldnt figure that one out. thanks
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Old 08-22-2008, 05:03 AM
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block

Quote:
Originally Posted by BOBCRMAN@aol.com
If you were to look at the pistons that were in the bore directly above that rail letter, you would see that it would have the same letter stamped into the top.

Every bore is different size and to make up the difference. The pistons are graded for fit. A "C" piston in a "C" hole. An "H" piston in an "H" hole, etc.

The pistons are selective fit. Placed into a rack that travels to the block and then installed while going down the production line.

Thanks Bob , that was my learn something new for today..
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Old 08-22-2008, 05:20 AM
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I always wondered what those were for. Thanks Bob
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