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

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.

ooo ok now that makes sense. i see now, i dont know why i couldnt figure that one out. thanks

Thanks Bob , that was my learn something new for today..

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K-Star Automotive
Performance Engines
It's better to have a gun and not need it, then need a gun and not have it.

I always wondered what those were for. Thanks Bob