What should the spark plug be gapped to?
For Super Stock the spark plug gap should be .040 to .050″. Mod, B, and AA engines with electronic ignition have the side electrode removed and there is no gap adjustment is possible. This technique works very well and optimizes ignition. Top What color should the spark plug be? A light tan or brown generally indicates of a properly adjusted carb. However, some engines do not color the plug at all, yet it is a normal condition. This is due to an uneven air-fuel mixture in the combustion chamber. This is sometimes referred to as fuel “Wash”. A black plug indicates too much fuel and a silvery gray or white plug may indicate too little fuel. NOTE: Aluminum deposits on the spark plug may be the result of extended operation at high Rpm’s with a very lean carb setting. Catastrophic engine failure will result if this is not corrected immediately! Exhaust gas temperature is a simple and accurate method of tuning your carb. • Stock – 1250-1300F • Mod – 1300-1350F • B – 1350-1400F Exhaust gas te
