I bought the motor rebuilt with a head on it. I replaced that head with the one I had in the old motor. I had it serviced at a machine shop local.

I used 30 wt break in oil with zinc. No zinc now after oil change. I don’t want to pull the head just to have it checked.
So you suggest doing the wind out thing first? It has a low rear end so I use a tachometer more so than the speedometer. Rarely drive over 50 mph or 3500 rpm.

It smokes when I rev the motor initially too so I don’t know if that relates to valve guides?

Last edited by Phak1; 10/31/2024 11:54 AM. Reason: Spelling

1953 Chevy 153A 3/4-ton
Working on my project since 2015
Follow along in my DITY