Thread: Big block valve train clatter

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Originally Posted by t0oL

have you tried retarding the timing or premium fuel?

after ruling that out
perhaps a higher volume oil pump?

I did retard it 2 degrees and it made no difference, although I would (probably will) try higher octain fuel, at this point I'll try anything! It doesn't really sound like ping though, I picture the sound like a lifter slapping or something. But it makes no sense. No knock at idle, knock begins about 1000rpm, then goes away under load, now comes back at any speed off load (coasting) and goes away on deceleration. I'm afraid to try a higher volume pump (may already have one) the pressure pegs the stock pressure guage until it warms up and then stays fairly high.

Thanks for the ideas!