Piston to valve Clearance?

[gvr4]

There could be a number of places that deck height difference could come in. Actual deck height (crank centerline to gasket surface), rod length (doubtful but who knows?), or compression height (wrist pin centerline to quench pad).

I didn't measure my old rotating assembly, but IIRC, it wasn't more than .02" in the hole.