What's the max boost can a stock head gasket hold with arp 425 head studs? And is there a better head gasket out there without using fire ring or o rings?

 

There really is no magical number. I would only use a Genuine Cummins Gasket.

Luke

 

So with the mods in my sig do you think it would be ok to put the cummins head gasket back in without o rings

 

not with the compounds. you are running risky. def limit boost from the big charger maybe 50-60psi total. i personally wouldn't push much harder than that.

 

It was set on 60 but going to set it at 50 when the head work is finished tomorrow.

 

is it a ported head? if so it will flow better and i would run a bit more boost.

 

What does ported mean? The head is being resurfaced and cleaned tomorrow if that is what you mean.

 

LOL... that is not what i mean. 50-60 and a good tight seal should last you a good while. if you drive it sensibly.

 

I know I'm stupid mechanically speaking. What does ported mean?

 

A ported head will flow more and make more power at lower boost because it is moving more air. This is assuming you have the ful o make more power. Boost alone does NOT make power if it isn't at the smoke point.
I ran 55 lbs boost with my 02 and compounds with stock gasket and over torqued stock head bolts.