Hi Folks, Gotta good question for ya. How do you decide on a baseline spark plug to use for a performance engine build. Been having excessive fouling problems and it started me thinking about it. Usually, I start with a stock plug and go from there; maybe up or down based on the build and then read 'em. In this case, I built a late-model 350 SBC w/roller cam, but w/186 ported heads, headers, high comp. pistons Unilite distro, MSD ignition, Victor single plane, blah, blah, blah. The engine's almost new and the carb's jetted right, so this engine is effectively nothing like what it came like from the factory. Does anyone have some serious experience/technique/etc. about determining a starting point for plugs? [I'm not talking about plug reach and threads.] Best Regards, Drink
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16 years ago