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Registered
Join Date: Oct 2001
Location: Westford, MA USA
Posts: 8,861
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I agree, something sounds strange there. If I were you I wouldn't run the motor again until you have spoken with the machinist who assembled the heads. Rather then being your technical problem to solve, it should be his customer service problem to solve.
By the way, did you check all of the valve clearance when you put the heads back on?
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John
'69 911E
"It's a poor craftsman who blames their tools" -- Unknown
"Any suspension -- no matter how poorly designed -- can be made to work reasonably well if you just stop it from moving." -- Colin Chapman
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