Thread: Fresh BBC; Noisy Valvetrain

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you need more than 500 on a big block to need long slots if you looking for answer ? on your lifters you could have some junk in the lifter like denny said .about putting one new lifter in that hole yes you could do it if the lifter is not wipe out the face of the old lifter looks good you could try a new lifter i would say you have 50/50 chance and it may not work. i would take the new lifter and sand the face a bit with wetdry 600 grit paper with WD40 and see if it takes. sanding it will help the new lifter brake in use moly on the face of it make sure it turns free in the bore oil only on the body not moly .the moly should only be on the face of the lifter