HI
LEARNING to read the color of a gasoline engines spark plug might be one of the best ways to determine how the engine is performing internally
when correct the plug s/b the color of a brown paper bag-if whiter you are leanif darker you are rich it is that simple and works for all gasoline engines
back in the day i held a track record in super stock with a 409 63 chevyand reading spark plugs helped me get there
BEST REGARDS TONY