[ae1969]

Uhmmm I wasnt referring to JA's engine. I was actually referring to other cars that he actually tuned and made mistakes...... but we all make mistakes its called trial and error. This is not a danno issue anyway?

You obviously have not opened up one of these engines before. The blocks are virtually the same as you mentioned. The pistons as you mentioned are dished and lower the compression but the turbo bottom ends have a forged rods as well (83' NA's have forged and I have heard of random 84's having them as well.) A stock NA bottom end will not hold 600-700 hp ROFLLLL ..... I havent even seen a stock a 951 bottom end hold that except for a couple of glory runs.... and the Doom cars were FARRRR from stock....

Reducing the compression is the key as you mention. The dilemna is not only 'tuning' adjusting fuel, timing etc. The problem you get on a high compression engines is having to deal with ridiculous egt's as well. As the temps rise ... you guessed it. Detonation.Melt down etc....

The only way to properly run any boost over 8-10 psi reliably is to use a 951 bottom end.

I wouldnt be recommending to anyone to run higher boost on any NA engine. I have seen the aftermath of such endeavours. Cracked pistons, shattered rings, thrown rods...... etc.....