Quote, originally posted by stealth GTi » no, you can't.... im not exactly sure but 20 psi on a stock rebuilt motor even with a headspacer will result in nasty things
negative, sir...you can run 20psi on your stock internal VR6 w/ a headspacer. 8.5:1 would be ideal but I've done it on my 9:1 headspacer. It's pretty much for the dyno only but a highway run on 20psi isn't out of the question.
I would NOT daily drive 20psi straight up though...so that part of ervlydeux's statement isn't wise....you can if you want, though.