Quote:
Originally Posted by bondvagabond
About the only problem I have heard of with the pre powerstroke 7.3 na idi's is popping head gaskets above 10psi boost, or 15psi boost with arp head studs or 20 psi boost with studs and girdle.
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That is not caused by boost pressure alone. When these engines are said to die from ____ level of boost, this largely due to people using too small of a turbo, running high drive pressure, scorching intake air temperatures and no intercooler.
I see up to 20psi of boost when I go back down to sea level. I have a 6.5L block and OE style torque to yield head bolts.
But I run 2 grossly over sized turbos and the boost is intercooled. So drive pressures are much lower than someone trying to force 15psi through a GMx series turbo, and running drive pressure to boost pressure ratios of up to almost 4:1 (40 to 50 psi of drive pressure to make 10 psi of boost pressure).
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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