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Home > Customer Service > When should I be concerned about piston to valve clearance?
When should I be concerned about piston to valve clearance?
FAQ As an engine builder, you should check this clearance anytime a parts or machining change is made which may affect piston / valve clearance. Changes to rod length, piston design or pin height, deck height and cylinder head milling are among these factors. The procedure is; with the head removed and the piston at TDC, attach a small piece of clay to the piston top. Re-install the head, without the gasket and move the valves to max lift of your cam or rotate the engine. Measure the thickness of the clay at the contact areas. The addition of the gasket thickness should be taken into account. Safe numbers are .080” on the intake side and at least .100” on the exhaust.