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Cold vs. Hot Lash
Block Material

Head Material Lash Adjustment
Iron Iron Add 0.002”
Iron Aluminum Subtract 0.006”
Aluminum Aluminum
Subtract 0.012”

With an iron block and heads you would actually add 0.002-inch to the hot lash spec for a cold engine. So if the cam card tells you to set the lash hot at 0.020-inch on the exhaust side of the cam, for a more accurate cold startup, we’d set the lash at 0.022-inch.

As the engine warmed up and expanded, the lash will be very close to that spec. Of course, you still should check the lash on all the valves once the engine is warm, so these specs should only be considered as recommendations. But they will still be very close.

Rockin’ The Lash: Setting Valves Cold With Hot Lash Settings