Posted by notjustair on June 26, 2013 at 19:16:50 from (174.229.73.238):
I'm looking for the folks who know something about plugs:
I bought new plugs for the grain truck. It had AC R43 in it so that's what I wanted to go with. I think the R means high heat range doesn't it? The truck doesn't burn any oil. It does run rich at idle but I have never had it foul any plugs.
Anyway, I got home from town and the guy at Auto Zone gave me AC 303. I didn't notice until now.
What is the difference between these two? They are gapped correctly - will they work? The truck is a 1958 GMC with the 270 straight 6. I really don't want to have to spend an hour in the car tomorrow to get the other plugs.
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