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You're at the edge (maybe over it) of blowing a head gasket at 40psi with factory bolts. That said, I ran one for years at 50 psi on over torqued factory bolts with no o rings and never had an issue. A guy who built some hot Cummins engines for race trucks told me what to torque them to and it would hold. He was right. I broke everything else but that old 300,000 mile engine ran like a song and never gave a minute's trouble. My current truck let go after about 18 months of 45 psi at factory torque specs. I wish I could remember what the torque spec he gave me was and I would tell you.
1998.4 Dodge Ram 2500 4x4,NV4500 w/ 3850# SBC,Borg-Warner 64/71/14 charger,5x.014 injectors,Full cut DVs,4k GSK,60# springs,Mazzi Hulk wheels,Toyo Open Country 325/60R18 tires
I think your timing plays into this as well. The more you advance the timing the higher the cylinder pressures get.
other factors may include exhaust back pressure and intake air temperature.
If you are putting in hot air it wont expand as much as cool air would.
if the exhaust/turbo housing doesn't let all the spent air out easily, you wont have as much room in the cylinder for fresh cool air to come in.
people who block off the waste gate actuator on their stock hx35 will see higher boost psi numbers but those trucks dyno lower hp than trks who let the wastegate open and free up exhaust flow.
Timing plays a major role. I agree with drooling piston. 12 valve heads are said told hold more boost than 24 valves also. Another big role on the head gasket is prolonged egt's. More expansion and contraction not to mention the heat against the fire ring in the stock gasket.
It all depends on how you treat it. With my setup I see 65 lbs on just studs and no problems yet. I also rarely see that kinda boost and when I do, I am sure to have it good and warm. Never let it see boost when it is cold.
'97-5" straight #100 ff, 19*, 4k gsk, AD II 165, valair dd clutch, 1-3/8" billet input, ARP studs, 60#, BD Super B over s475, 024's, Mayville WI best 5x14's,
'90-4" exhaust, kdp killed, pacbrake, 60 lb springs
What 12valvedriver said. I never get on my truck when it isn't up to full operating temp. On stock timing my truck ran 45 psi for a couple months. Then saw 40psi with 16* timing. For months. When I installed dvs it saw 50psi with the wastegate closed and held. It only saw that twice. Then with the new turbo its seen 55psi once and normally holds about 45psi. But it rarely sees that. I drive my truck easy. And never get on it when it isn't up to full temp
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