Gents,
I’m currently having a problem fouling some of my spark plugs on cylinders 1,4,5,6,and 8. I’m using the recommended Autolite 3924’s. I’ve gapped a set at .044, and another set at .036. Same problem.
My set up is: 306 block, AFR 165 heads, Holley 650 dubble pumper, Edelbrock Air Gap intake, BBK shorty headers. I’m running 91 octane non-ethanol pump gas. Have the air fuel mixture set at a lean-best condition. Timing set at 13 BTDC.
When I have a fresh set of plugs in, it runs great on the high end, has some mild stumbling at low RPM under load.
Im looking for some insight, and a spark plug recommendation. I’m considering going with NGK 6953 plugs.
Any input is appreciated, thanks.
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