Sounds like sticking hydraulic lifters. If it quiets down after it warms up, I would say it's no big deal. Mine does that too, but only when cold. When it warms up, it is quiet. Is that the case with you too?

If it bothers you that much, just try buying a new set of lifters. That might do the trick.


52 GMC 3/4 ton pickup
68 Big Block Vette
68 455 Firebird