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Checking the valve-to-piston clearance is an operation best done before timing the cams (and rotating the crank). I would have suggested using clay or solder on the piston crown and light springs to close and open the valves.
At this point, you'd have to regress a little to perform the above. However, if your engine is factory spec with relatively low HP, it would be safe to just verify the cam timing is spot on, rotate the crank to make sure it rotates okay, then proceed. Still, checking is verifying so there's nothing to assume.
Checking the clearance is mandatory on any modified engine.
Sherwood
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