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Message: <blockquote data-quote="Marvin97" data-source="post: 503506" data-attributes="member: 10445"><p>Im building another motor to go in my car, but I need a little more information before I can purchase the last few pieces. 97 block, cobra crank, forged steel rods(stock length), ported piheads with maybe a set of cams if a cheap set comes by before its assembled. I need help with the piston selection though. I had planned on using the stock pistons with new rings and such since the car will only make around 400 to the wheels(conservative tune) when its finished. It will also have either a KB or a turbo setup from HP perfomance. A local guy here who is a modular guru apparently is worried that with the compression bump, I will only be able to run like 5psi, or have to run like 103 octane to keep it from pinging with anymore boost. So what size piston do i need to go with to lower my compression ratio? What is the stock compression ratio on these cars, what does it change to with the pi swap? What is optimal compression for boost? Thanks for the help, sorry it so long!</p></blockquote><p></p>