‘The instruction called for 1/8 turn preload for a street engine. I don't know how much distance that is. Is there a chance I lost the preload because of aluminum head expansion?‘
In addition to aluminum expansion, rocker studs on modern aluminum heads likely have a finer thread than factory, giving you less preload per ‘turn’
FWIW - 1/8 turn is very little preload. Cliff’s method of determining total lifter travel, then backing pre-load out from the bottom to 1/2 of travel may help here?
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