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I came across a set of 454 std. bore forged pistons. part number on piston is 6269362. these pistons have a slight dome on them. I was hoping maybe someone could help me figure out what the compression ratios are on these, or give me an idea how to find out what I can on these before I use them. I went to a gm dealer in town and they couldnt find anything on these but they went to the computer not the books. Help Help Please. Thanx, Brian
 

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Brian,

From what I can tell, that's the piston ID number, not the part number. Anyway, my Chevy Power manual lists this as a '71 LS-6 closed chamber piston, 9;1 compression when used with the stock 118cc open chamber heads. GM part # is 6262976.

Hopefully, someone else will chime in and correct me if I'm wrong.

John
 
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