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How much effect does cam timing effect piston to valve clearence?

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On the intake side a 1* at the crank is equal to around .003 to .004 lift at the lobe times rocker ratio.

Now if the exhaust lobe profile is similer you should see the same. It may be less since its Landing the valve.

But, requardless, your probably looking at around a extra .020 exhaust P/V clearence, with a 4* advance.

mike