Spark Plugs for mild 340

[mghikas]

Hey guys,
I’m currently running autolite 65s, looking to replace them as they come with the car.
I’ve done a search and there are multiple recommendations, would prefer NGK, what do you guys recommend?
Cheers from down under

 

[RustyRatRod]

Cross the Champion number that came stock in the 340 to NGK.

 

[mderoy340]

NGK 7373

 

[rumblefish360]

Stock to Mildly modified should use the same plug. The engineers figured out the plugs heat range that works best. Going hotter or colder should be done in 1 heat range step only until you find what is best. Generally speaking, it has to be a pretty hot build to start moving away from the OE heat range. Colder is better on hopped up power plants.

Like said above, if your not going to use that stock Champion plug, just stay with the heat range on what ever plug you choose.

 

[lilfontleroy]

stay away from those E3's - junk science