Engine noise in 383

Alaskan_TA said

Pull the valve cover.

Look for a bent push rod or a push rod punched through a rocker arm or lifter for starters.

If nothing is obvious with your eyes, move each rocker back & forth by hand to check for play.

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If one was punch through it would be not running smooth. That condition was what was wrong with the car when I bought it when I was 19 and it was 1.5 years old. Guy selling it probably thought he broke the engine and was selling it cheap. Turned out to be push rod thru a rocker. When I had the valve cover off the other day I did try and wiggle the rockers and none felt like they had a lot of play.