Originally Posted by
jpalessi
No secret, just the cost of a new plug and some accurate measurements..
Anyway... Here on the Northeast the temps in the summer are usually pretty hot, and humid...requiring a hott plug.. The P4 is usually good most of the time, but I'm pretty excited to try the new P5 this year on a nice clear day.. Good Luck !
birmingham,alabama.....we race locally here with alan burton ,shane keller ,scott porter, bradley seales ,morris spears ...in the summer its usually 80-90 deg f. and like 70 80 % humididty .....