#38773, "RE: Question about stock block..." In response to Reply # 0
Some guys have run 10+ pounds on stock internals for over a year without blowing, others haven't even made it to 8 psi on stock internals without blowing. Each engine is different. If you have it tuned on a dyno you have more of a chance of it lasting IMO but ANY detonation and you can kiss the ring lands goodbye. You may want to do a search on google for homemade race gas using xylene. A lot of DSM guys have the mixture down to make race gas with xylene and 93 octane to get 100 octane. If you ran 100 octane all the time I think you would have even more of a chance of staying in one piece at 10 psi on stock internals.