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RZ,
One of the oldest ways is to add some modeling clay to the top of the piston, install the head and rocker arms and rotate the engine two turns, remove the head and section the clay to see how much clearance you have. Another easier way is to install the head with a weak spring such as a brake spring on the two valves, rotate the engine to top dead center and put a dial indicator on top of the valve. Push the valve down until it touches the piston and note the amount of travel. Subtract the amount of cam lift at the valve from this measurement and you have your clearance. Easiest and gives the truest reading.
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