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Author of "101 Projects"
Join Date: Jan 1995
Location: Rolling Hills Estates, CA
Posts: 27,056
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You must have 1.5mm clearance on the intake and 2.0mm clearance on the exhaust. The measurement check at assembly is done when the engine is cold - everything expands when hot. If you do not adhere to these specs, then you will have contact at high RPM when the engine is hot.
-Wayne
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