I am currently running 30psi unintercooled, or so on a KKK24 everyday, the motor has about 40K on it, and shows 490psi across the board, and I have never had a HG problem with it. Pump is only moded by huge cut in fuel pin, and minor revlimter mod.My previous car, I ran 35psi+ and beat the crap out of it, it had every last concivable mod that you can do to a stock pump, I ran both the T3 and the kkk24 on it, and it had enough fuel that it spooled it close to as quick as a k14 on a stock 1.9td. It ran stock fibergasket and stock headbolts, and never had a hg problem. Yes it had serious EGT issues within a short WOT run, but was fun none the less.Now we need to get Malone or Dave @ PP to chime in about the franken motor as IIRC even with a 1.9hg and studs that it had some pressurizing of the cooling system, but I could be wrong.