More like a "thock thock" sound. Any thoughts? Goes away once engine reaches operating temp.
Motor and trans are out of an '86 Vette. I bought it in 2006, unknown condition, fired it up in 2013. I've put about 600 or so miles on it and the sound hasn't gotten better or worse. 5w-30 oil, 50 psi when cold, I believe 10 psi at idle when warm. No change in oil psi from 2013 to now. I've had the intake and valve covers off and the motor looked clean and cared for / low miles in those areas. No loose rockers although I'm thinking of running the valves eventually. Doesn't "tick" anyway.
Sounds loudest on passenger side. No more air injection pump, new water pump, all belt drive accessories turn freely. Noise is not back near the flywheel although I don't remember ever separating the trans and motor. A visual from underneath looks good. Working on doing a compression check right now.
