WHat spark plugs do you run?

[Imndeep]

I've been looking at this and am getting a bit conflicted on the grip length, Some are 3/4 inch (NGK 4554) and some are 3/8 inch (NGK XR5). That a big difference. I got a bone stock 383ci with current crust old Chamion J12YC's. I have a Mopar Performance Ignition box plus a Accel Super Coil. I'm trying to get a hotter spark to take advantage of the MP MSD wanna be box and to prevent gas fowling. TIA

 

[bigmanjbmopar]

I am running these now http://www.jegs.com/i/NGK+Spark+Plugs/739/R5671A-7/10002/-1

They are in the hotter range and seem to be good overall, with the 5/8s hex the fit is better and you still get the extended reach, your 383 will be happy

Or you can choose from a NGK list here.

http://www.jegs.com/p/NGK-Spark-Plugs/NGK-Racing-Spark-Plugs/753645/10002/-1?itemPerPage=60&pno=1

 

[Bigal75]

Ngk