rod_b

Anyone got more info on OD plugs!? I was told 77 plug for .12 using 20% or less. 99 plug for .12 > 20% or big blocks at any nitro content? Is that right? I've been running a 77 in my OS .21 @ 20% but it hasn't run as smoothly as it was when I ran 30% and a 99 plug. Should I just use the 99 with 20%?

StephenSobottka

iTrader: (8)

the 99 is going to be run for your bigger engine, i run the 77 with 25 percent nitro in my sedan. it runs fine but like ne thing it just has to be tuned properly. the 99 is the colder plug and probly would be your best bet for your .21 engine.