Tingram

how much boost will a stock head gasket hold without putting o rings in the head and just installing a set of studs, i was thinking someone said about 65 psi.

Fergavs

I dont think much more then 50 reliably. I realize many run that with no studs but I wouldnt call that a reliable amount. Anything over 45-50 with out studs, 50-55 with studs, and 65+ studded and ringed is asking for eventual failure.

KLockliear

All stock 2nd Gen standard output engine - 62psi, HO engine 55psi.

busa

I've been 45-50 for awhile now, just wait till shes warm and don't hold it there all day.

kawi600

Its dependent on more than just boost. Injection timing, compression changes, and drive pressure. water/meth and anything else like propane or NO2 will raise cylinder pressures.
I was bouncing off of 50psi for a long time before I installed a cam and popped it within a couple days. So now its getting studs and orings.
Cam allows this motor to breathe a lot better. I used to be able to smoke it on command but now even if I put my foot into it with the wrong load / rpm it doesnt smoke much. Thats a lot more air.