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Expansion rate on a all aluminium engine is .015/.018.This can be subtracted from the recommended hot lash setting,but never go tighter than .005. Example:If the hot lash is .026int..028 exh.Then set int.at .011 and the exh.at.013.Then check lash hot.By doing this you can determine the actual expansion rate and zero in on the correct cold setting.



I agree, but it also might matter where you live and how cold it might get when starting. For example, I have customers that have to start their aluminum engines in the winter when it's 30 degrees in their shop. With a World block and Stage-V heads I set the cold lash at .005 (when very cold) just so the valves will actually close. After warm up I typically see about .020 and .024.