I have a bare set and they definitely need work for a N/A perspective. I think Paul did a review last year and his comments match what I am seeing. Short turn issues, core shift, valve seat concerns, etc.
This isn’t a Pontiac only issue. There are videos out there from well known head porters that review other brand SM heads and they have the same/similar issues. The ironic thing is there also videos from the same people review big name head makers and they have some of the same issues too.
What ever head you choose be sure to have a reputable head expert look at them before you put them on, just my $.02.
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Systems under stress fail catastrophically
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