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Originally Posted by Cobra #3170
blykins is right, perfectly normal condition for Aluminum blocks and heads. My cold valve clearance is .008 n and .008 x when warmed up it is .020 n and
.020 x. The only issue I have had was that I needed a chain tensioner for the cam drive because it was so slack and noisy when cold. A good reason for a nice easy warm up with an aluminum engine.
A belt cam drive will solve this problem, but it is very difficult to package with a dry sump pump.
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That's odd. I have a Shelby aluminum block and heads with a flat tappet cam. My lifters are very noisy until the engine comes up to temperature, implying larger clearances when cold.