150 shot plugs?

[tenracer]

will the ngk 8 be ok for a 150 shot,or should I go colder? This will be first time I spray it so I'd rather not hurt anything. AFR 220 heads. Also should I use projected tip or not? AFR reccomends ngk r41 for race.

[Randy 406]

What is your compression, and what fuel do you plan on using?

If it is around 10-1, and you are going to use some decent fuel a NGK5671A-8 will be fine. Pull 6 degreees of timing, and go have fun!

BTW, never run a projected tip plug with spray. The ground strap is to far into the combustion chamber, it will get hot enough to cause pre-detonation.

[1slowdime]

I have a 190 shot and have been running R5673-6 thats what ngk recomended im at 11.3to 1 comp and have a fuel cell up front with 110 in it for the spray

[tenracer]

Thanks for the help.The motor is 11.to 1. I'm gonna get fuel at the track ,not sure what they have yet.