Quote:
Originally Posted by P@blo
A 322psi rate spring with a 110psi seat pressure will put you at 271psi open pressure at 0.50" which is perfect. I had a set of 670s done and used the 995 402psi spring and have 292psi open which is perfect. Not sure the focus on closed pressure but I would keep open pressure to 300psi or less.
Also, I would not trust anyone, Pontiac friendly or not, who did not verify a spring fits before installing. Not by a country mile. The issue should have been caught when checking the spring pressures before sending the heads out the door too. Two strikes right there. The third would be them willing to fix it for free. I'd run the other way with the heads you have. Scary really.
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How do you take into account the pressures lost during the first couple heat cycles?