Hey beater!

Yeah a decade can sure change some stuff!

Yeah the thing was I broke it in without an exhaust, drove it with only a downpipe for a bit, and then put an exhaust and muffler on last summer. I�m not sure if it was always there or if I only heard it after I put the exhaust on.

Are you saying that it went away after changing headers meaning it was probably an exhaust leak?

The other thing I remember thinking last summer was that because the sound seems to come in and out like 2-3 taps and then silence and then 2-4 taps, it might be a slightly bent pushrod? The channels between the pushrods and head are pretty darn close and I did see a tiny bit of wear on the coating by the head on the pushrod when I was resetting the preload in the hydraulic lifters. Maybe the play in the roller rockers makes a pronounced tap as the pushrods are rotating around? Just a thought I suppose. It�s the only thing I can think of that would oscillate in that pattern.

It has about 1200mi on it so if it was catastrophic, I assumed it would get worse or have smoked the motor by now. There was no glitter in the oil filter with the break in oil either

Appreciate the input!


69 Buick Special Deluxe. Intercooled Turbo Chevy 250 @ 15psi on a stock long block. It's kinda fast.