10-08-2012, 06:23 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Generally the use of coatings is used for friction reduction and anti-wear benefits.
The two spots where I see expansion the most on an aluminum block combination is in main bearing clearances and valve lash. I run about .0005-.00075" tighter bearing clearances on the mains. On the valve lash, solid cam engines get about .004" more tighter lash when cold and hydraulic lifter engines get a tad more lifter preload.
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