Recomend a spark plug to start with. Engine is a chevy 454 bored 030 over flattops 110 cc edelbrock ovals (60459) has a hyd roller camshaft duration (@.050 in): 224 degree intake / 234 degree exhaust Camshaft lift .527 intake / .544 exhaust
edelbrock rpm intake Holley 750 vacum and a HEI ignition.

Edelbrock recomends a Champion spark plug RC12YC but that plug has 13/16 and projected tip I want a 5/8 and non projected tip and preferably NGK. Thinking about this Ngk´s BKR6E-11 do you think they will work i`m running them in my 489 with Brodies and they work well?

Marcus

More info needed - driving around town, race only, any power adders, fuel?

Street driving, pump gas and no power adders.

Marcus

That's the same plug most aftermarket heads take. A NGK R5671A-7 (Stock #4091) would be a good choice, that's a non projected tip, 5/8 hex, .750 reach. It's a good plug for N/A. The Autolite version is a AR3935

hi john,thats what dart recommended me on motor passes.i love the plug!!!

also maybe call the cylinder head manufacturer they prob did lots of r&d i would assume

Hell thats the same plugs we use in the blown alky motor, but we use the -9s. I ran the -7s on the NA motor, never had a problem with that plug.