STREET DUTY SPARK PLUG RECOMMENDATION?

[2vette2camaro]

I am looking for spark plug recommendations for getting started with my combo.

451 low deck, 11.2 comp,
trick flow 240 heads
230/240 @50 110 cl
gasoline
msd 6al ignition
primarily street duty.
I am looking for a recommendation to start working with.

 

[ruffcut]

I'll be watching. I'm building a 512 w/ Trick Flow 240 heads. Will be for street use. Ruffcut

 

[beanhead]

BKR6E if you like NGK. As long as those heads take the common 14mm thread x 3/4" reach plugs.

 

[2vette2camaro]

Yes they are 14mm x 3/4 reach. Thank you.

 

[coloradodave]

#3924 Autolite are what I use in my Indy heads (14mm x 3/4" reach).

 

[383man]

I am using NGK-R5671A-7 with my Indy EZ heads. Indy recommended these plugs since my car is a 99% street car that I race once or twice a year. Been using them since 2011 and never a problem. My eng is a 493 (440 with 4.15 crank) and 10.6 comp with good .046 quench. Never any ping at 36 total and runs great. Ron

 

[440rb]

Same here, R5671A-7 on our 10:1 mild race headed/solid roller 589, no problems yet with 40% street use + 60% race, I've personally never used anything but NGK ever on my junk in the past.

 

[Dennis H]

NGK.

 

[coloradodave]

Here's a great spark plug cross reference from Autolite to most of the major brands:
https://www.autolite.com/docs/defau...standing-spark-plugs/auto_crossref_0311_0.pdf