O-Ring Head

[JQmile]

It all depends on the truck. CR's seem to hold up better than the earlier models, especially with $$$ studs. My truck made 448 at the wheels through a non-lockup converter on a crappy 89 head gasket,bolts, 55 psi, about 90 psi of drive, and nitrous. BUT I was only running about 16 degrees of timing. I think an early and violent pressure rise is what kills head gaskets.

 

[roachie]

Some cant afford the down time though.

 

[XLR8R]

Cylinder pressure - from combustion - is the only mechanism which can lift the head and/or compromise the HG on a running engine.

Manifold air pressure and turbine inlet pressure may roughly approximate actual peak cylinder PSI.

 

[kazairl]

Cylinder pressure - from combustion - is the only mechanism which can lift the head and/or compromise the HG on a running engine.

Manifold air pressure and turbine inlet pressure may roughly approximate actual peak cylinder PSI.

What about the efficiency of different turbos at the same boost pressures? Wouldn't knowing the Air temp entering the cylinder also be a good thing to know if we are estimating "limits"?

 

[Kronic_187]

i got almost 280,000 on the clock... and i'm going to assume it's the stock head gasket... i got my BOLTs torqued to 125 ft/lbs. and i regularly hit 43ish psi. 16 degrees of timing so far....

kinda tempted for more, hell i even got a spare head sittin gin the shop... just not sure what to do.... send in spare head and get her P&P'd and o-ringed.... or just buy studs, swap on a fresh gasket and get'r timed for about 18 or so and see what happens

 

[CLC12v97]

id like to know if theres a place around houston Tx that will do o ringing... if anyone knows pm me please!

 

[will8]

I agree its cheap insurance. Its costing me $200 to have them installed.

 

[XLR8R]

What about the efficiency of different turbos at the same boost pressures? Wouldn't knowing the Air temp entering the cylinder also be a good thing to know if we are estimating "limits"?

At best, intake air temp would only be a vague indicator of cylinder pressure.