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Hi Marti, Steel expands 0.0000063 inches per inch per degree F. A typical exhaust valve is 6 inches long, but most of the valve is kept near water cooled temperatures, and only about 1.5 inches is exposed to the fire. Therefore 0.025 inches expansion, over 1.5 inches, would require...

Hi Marti, Do I take this to mean that you think a setting from 0.010 to 0.025 on the intake will do damage, but 0.025 on the exhaust won't? -Chuck

If 0.025 is safe for the exhaust, anything from 0.010 up to 0.025 is certainly safe for the intake. The exhaust valve runs much hotter than the intake valve, and as a result wears more quickly. Intake valves don't wear much at all, so 0.010 is probably perfectly safe... IF... you check valve...

It is vitally important that the intake and exhaust valves close completely when they close. To assure that this happens, the valve rockers are adjusted so that when the valve is closed, there is a small air gap between the rocker, and the valve stem. This gap is called valve lash. The lash...