Purple Shaft lash question.

66fs said

I assume you are running Aluminum heads? The OP is running cast iron W2's. Lash will tighten on an iron head engine.

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I have never seen an engine with iron heads have the lash close up from cold to hot. I've seen some that opened up just .001-.002 but most open up .003-.004 and aluminum grows on average .006-.008.