Spark plug...Again

[broncoman6524]

Nearing the turn-key part of round two on my 383.

Speed-pro pistons (9.4 C.R.), Patriot 195/64cc Aluminum heads.

Should I stick with the trusty ACR45TS plugs? Or switch to a different plug because of the aluminum heads?

 

[scooter122983]

I would ask who built your engine. If that is you, then go with what works and adjust from there.