I believe the oem spark plug reach is .460" however, do i absolutely have to run that plug reach? its stock L98 heads on a 355 cid with flat top piston i think 10.5:1 compression ratio.

 

What would you run instead?

 

i wanna run a shorty ngk or ac del. plugs but the only ones i have found are either .375" or i could get a .750" i have hedman headers 68460 i was running the u groove accel ACC-8199 but they really do foul up rather quick.

 

A shorter reach won't extend into the chamber and the charge will take longer to burn. A difference of .085" probably isn't the end of the world, though.A longer reach will extend too far into the chamber where the piston face might hit it, and when the exposed threads foul with carbon removing the plug could be difficult without damaging the threads in the head.

 

that makes sense. Could anyone reccommend a good shorty spark plug with .460" in. thread reach? or should i just try another type of shorty accel plug?