what plug to run

[beebemotorsports]

i have a SBC 406 dart iron eagle heads should make around 500 to 550hp

on motor and spray it with a 250 fogger

what NGK plug should i use on motor # 7 ????????????

[Chris Uratchko]

7 is pretty hot .... I'd rather see you run a 9.....

[Monty Mikho]

I agree with Chris.. You might be able to get away with an 8 but start at 9 and 118 fuel..

[beebemotorsports]

this motor is 10.5 to 1 comp

[Monty Mikho]

:oops: :oops:

114 or even 112

[Monty Mikho]

Also a #7 might work.. Start at 8 and see what them plugs look like. If there is no heat in them then go to a #7...

[beebemotorsports]

i'll take the #7 back and get # 8

should be DYNOING it this weekend or next week

[Chris Uratchko]

Well you can lower the octane definitely but I think at 'least' start with an 8..... never hurts to be cautious.

[beebemotorsports]

thanks i will get # 8 and let you know how it goes next week

[Tom McDunnah]

7 is pretty hot .... I'd rather see you run a 9.....

I agree here with Chris, a 9 series is what most nitrous users use on their engines, it is alot easier to tune with,

Personally I like to run Autolites,myself and for your application I'd run the AR135 plugs, they are in the 9 series heat range,
If you are tuned to optium and find you have a cylinder running a little warm you can run like a AR134 in that cylinder

The reason I use autolite is the ground strap is not shrouding the cylinder, you get alot better burn in the cylinder

Just my .02 on this issue

Tom