well, if boost pressure on a stock engine/valve train would cause it to fail, you better come over and tell that to my stock wore the fuck out nisan L24e with a T engine, that i boost the ever living FUCK outta..i have NEVER had a valve train problem unless i over reved it, like a few times i have turned it to 8600 rpm's, and had a cam follower spit out, but so long as you keep it in the stock range (7k or less for my car) it has NEVR EVER EVER been a problem...like cronic said, you ARE the weakest link, good bye