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Discussion Starter · #1 ·
new motor bbc nos 598 14.1comp bmf conv heads.motor came with ngk-10.not sure if just to be safe when dynoing or they figured i was just going to spray it right off and just put a cold plug in it.im gonna run it na for a while and think it will need a warmer plug???.would a ngk r5671a-7 be a good place to start.thanks
 

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plugs

I run the Autolite AR3910 In my NA motor
 

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I have a 598" 13.5:1 and we run ngk 7's and 8's N/A.We run 10's in the motor with 350 hp shot with no problems.We tried leaving 10's in it to run N/A and it fouled the plugs.Hope this helps.
 

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Discussion Starter · #7 ·
Thats what i thought thanks i ordered 8s for N/A.
 
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