Spark Plugs?

[Fastand fury]

I have a 64 Sport Fury, 383 block but is now a 496 stroker! I'm running a Edelbrock Performer, a 770 Holley and electronic ignition. Trying to find the best spark plug to use.

 

[pnora]

What heads?

 

[Geoff 2]

NGK '4' heat range if alum heads, '5' if cast iron.

 

[not so famous bob]

NGK '4' heat range if alum heads, '5' if cast iron.

I`ve got 5`s in my 440/505 , been thinking about going to 4`s , what size engine are you running them in ??

 

[Fastand fury]

What heads?

Stock heads with a mild hydraulic cam

 

[pnora]

Stock heads with a mild hydraulic cam

That is going to limit choices with the short reach gasket style plug.

 

[Geoff 2]

I use 4s in my all iron 455 Pontiac engine & also use 4s in a 487 Ponty stroker that has alum heads. I think next after using carbs that are too big....comes using plugs that are too cold.