Re: A rather Iowa find: 1961 GMC 1/2 ton Dually
I hadn't changed the plugs yet, although I suspect they may be the issue.
Oil was OK last I drove it, and that was my first thing to check.
Sadly, when the knock came up (in August) I was just starting my last semester of college so I had to leave it back burner to focus on graduating. Now I've finally got time and am trying to get her fixed.
Thanks for the tips!
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