340 spark plugs

[moparkid340]

i need to no wat spark plugs i should buy for my 70 340 its 10.5.1 comp about a 510 lift cam

 

[66340SEDAN]

I run NGK plugs (TR4 I think, need 2 check) in my 340 engines, always worked great!

 

[street demon]

Ap65

 

[fstfish66]

i run auto lite 63 last time i bought them they were like 93 cents at walmart,
you may need to experiment with heat range,i have low compression because of the blower,,,,

 

[Thrashard340]

I run a similar combo. I use Autolite AP65's too.

 

[Longgone]

The factory suggests a Champion plug , RN9Y. I`ve always had good service from Autolites though ,the AP65 would be correct for your application.

 

[rumblefish360]

I also would start with a stock plug. I think you'll be just fine with that. Work a step cooler at a time to see if you can find an improvement at the track.

 

[Woodys_Cuda]

I'm using Champion RN9Y's here. I'm running a similar cam/compression.