spark plug recommendation

[408maro]

i have a SBC 406 with dart eagle 215 heads.. mostly want be a street car with some auto-x in the future

right now it has autolite AR133 plugs as per recommended by darts website but from what i understand these are more of a race plug and colder plug so foul out easily?

ive been messing with carb/timing to get right with this new setup and afraid these may be playing a part in all this

any of you have these heads and what do you run?

autolite,ac delco, ngk?

thanks

[Derek@ModernSpeed]

NGK is a better plug IMO. What's the compression, fuel, rpm range, etc? Also what type of plug does it take( solid gasket .750" reach 14mm etc)

[MonzaRacer]

NGK , Denso, AC Delco are my preference.
In GM I still like AC plugs.
Now I have found that Motorcraft will interchange with the AC plugs.
And never cause an issue also.
Only car I run Champions in are Chryslers products that come stock with them.
I pass on Bosch Platinums anymore and NEVER run Autolite, the fit nothing, are stock for nothing and honestly see no reason to run thwm.
Now, I have had some luck running Bosch Supers in certain engines, even GM. But I still stand by my preferences.