Hank, I agree that you need Quench to minimize detonation. I had not intended to turbocharge my engine again when I bought 232 pistons off ebay. I assumed they would have a smaller dish that 258 pistons. I was wrong. I received a piston that was highly polished and had a huge full circle dish. Sat .090 in bore so I figured it would have way to low comp. ratio so I turbocharged it. I must be lucky as when I ran stock 258 pistons I had lots of detonation under full boast, I have none now. Sometimes we just get lucky. Mike
