what plugs to run in my 440

[trudysduster]

Hey guys, I am doing some upgrades on the 440 and need to know if I need to change plugs. I have been running RV12C for the longest time. But I am changing the heads and going with the 440 source stealth aluminum heads and going from a 600CFM to a 750 CFM Edelbrock carb. Should I change my plug choice and if so which ones would be the best. Thanks, Bill

 

[halifaxhops]

I would run those then read them to see what direction to go hotter or colder. Every combo is different.

 

[halifaxhops]

 

[PRH]

“Most” stock BBM passenger car/light truck heads use 14mm x .375” reach, gasketed plugs with a 13/16” hex.

Most of the aluminum aftermarket heads use 14mm x .750” reach, gasketed plugs, with a 5/8” hex.

Like an NGK BCPR6ES.

 

[RustyRatRod]

Not bein a smartass, but I would call 440 source and see what they recommend for their heads.

 

[Bewy]

NGK 5 heat range for general performance & drag racing. Alum heads conduct heat better than iron, so will pull more heat out of the plugs.

 

[Kendog 170]

Spark Plugs-store.440source.com
They are RC12YC
I've been running them with my 500 RB with Stealth heads.

 

[trudysduster]

Spark Plugs-store.440source.com
They are RC12YC
I've been running them with my 500 RB with Stealth heads.

too many choices for me. I will 440 source and see what they reccomend. thanks

 

[mygasser]

too many choices for me. I will 440 source and see what they reccomend. thanks

then if it's not ngk get the ngk equivalent