Ignition timing. I put my drag engine into a street car. When I was curving the distributor to prevent detonation the plugs suddenly fouled. Prior to this the car ran fine but there was a little black blotch on two plugs as if the rings were rattled and allowed oil to burn onto the porcelain of the plug. Instead of changing distributor springs I changed the bushing which changed my base timing. I'm going to clean the plugs and put original bushing back in to confirm no other problem. Situation made me wonder if base timing could create fouled plugs.
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