Generation IV Internal Engine - mystery piston...help please
07-10-2012, 08:29 PM
So I bought a disassembled ls7 shortblock below are the pictures of the pistons. I am having a hard time getting info on brand and specs. The numbers on the skirt are
809ts & 28583
07-11-2012, 10:33 AM
Anybody know how to get info on these
07-11-2012, 10:35 AM
Those were some proprietary Diamond pistons we had made for us in large runs. They were setup for 4.125" Bore, 4.000" Stroke, 6.125 Rod Length, -3.84cc Valve Reliefs. I believe their valve reliefs were setup for the ETP LS7 heads.
07-11-2012, 02:00 PM
Thank you Matt... everything I was looking for. Just one more thing, can I get some compression specs, please?
07-11-2012, 03:41 PM
Compression distance was either 1.115" or 1.120"...I am sorry I do not have the exact on them because we haven't had a set made in close to 5 years.
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