im running a B&m MINIBLOWER on my 66 mustang, 302, 6LBS of boost. i pulled the number 1 spark plug today, and it was a reddish brownishiy color.. i think its burning too hot but i dont know.. can anyone help? should i get a degree cooler for it?

 

I always thought reddish brown was good...

But I don't trust my opinion enough to take a chance with your engine!

Don't they get kind of whitish if running lean?

 

[align=left]+1. That is the color you want. Post some pics of your engine.

 

if the plug looks like a fox then that's what you're aiming for. all good.

 

Greyish-tan to brown. Somewhere in that range, with no obvious signs of anything wrong, like oil or carbon deposits etc. Sounds like yours are fine.

 

 

Nice post Reverb!

Hey James W.,,, I nominate this chart for FAQ status!

There are lots of plug questions on here.

 

thanks for all the replies guys, i just wanna make sure im not pre igniting, and all that good stuff... preciate all the help ;] ...