07-08-2002, 02:51 PM
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CC Member
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Join Date: Jul 1999
Location: Prescott Valley,
AZ
Cobra Make, Engine: Previous ERA owner on break
Posts: 600
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Not Ranked
ERA 535:
Actually, I called Southern Automotive and talked with them (they built my engine and installed the Edelbrock heads). They said to subtract 0.012 from the iron head specs. Being basically a coward, I fudged that a little and subtracted 0.010 and went with the 0.014 number. When hot, I measured them and came up with the 0.024 clearance. It all seemed to work out OK.
Jack Z:
The correct answer is that the aluminum alloy heads expand more than the steel pushrods. This pulls the rocker arms further away from the camshaft when the engine heats up; hence the increased hot clearance.
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