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I did some research on turbobricks.com. They had a listing of all the compression ratios. The turbo has about 8.7 to 1 and the non has about 9.5 to 1. While I was doing some more looking around both sites I think I have found the problem. The engine was from an 86 model I think it originally it had the garrett turbo and the one I have is an 89 and it has the Mitzubishi turbo. I think this is explaining the slight differences. I still would like to know if any one knows the difference beteew the turbo piston and the Non-turbo piston.
Thanks for the quick responce Jim
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