Don't take a chance. You need about .100 clearance. I have seen guys put a piece of solder down through the spark plug hole and fish it over to where the valves are and turn the engine over ever so slowly till it squashes the solder, then remove and mic. But, if it was me headgaskets and intake are alot cheaper then bent valves etc. After you remove the heads check them with clay. Easy enough to do.
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