Valve Clearance on Larger Camshaft and Flat Top Pistons

DC 340 said

So tell me, how do you get an accurate reading from clay? Do you jam a caliper depth gauge into it with a flashlight and eyeball the reading? Do you peel it off and hope you haven't changed it? Then measure it with a caliper hoping you haven't compressed it?

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taught to me by an 18 time national record holder : fill the valve relief full of clay , even w the top of the piston , roll the engine over in a complete /contiuous rotation , pull the head , take a razor blade ind slice the remaining clay in the pocket in half , "up and down" or vertically , it can be done perfectly if your careful , then measure with a depth gage of your choice , ACCURACY DEPENDS ON YOU ! ---------FAILPROOF!!