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On my BBC comp cam hydraulic roller lifters I preloaded them 1/2 turn, they are a little noisy, mostly at idle, which from what I have read can be normal. Would going to 3/4 or 1 full turn be advised?
 

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Morel 1 full Turn.
Morel 15W40 no heavier. No 20W50...will not function.
Lifter to bore clearance for Morel dictated by GM .0015 to .0018"
 
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