crapr6

Hey guys just getting some parts rounded up for my new engine. I was wondering what spark plugs I should run. Here is what I have.
515cid
9.3to1 comp
dart pro 1 (310cc) heads
hyd roller camshaft
dart intake
900cfm AED carb
Going to the dyno next wed I hope, but would like to get an idea of where to start with plugs. Old comb made 616hp 645tq with a 509, iron 320cc merlin heads,same hyd roller cam, same intake and a BG 850 carb.
Anyway Dart recommends a autolite # 3933 Std tip, race
or a autolite # 3911 projected tip

Thanks for the help.
Erik

cubicinches

The Autolite racing AR3933 would be my first choice.

Young Performance

NGK racing R5671A-7
Eddie

Rookie

iTrader: (4)

Eddie, any interference with the stereo when running a non-resistor plug?

Young Performance

Not at all. Those are the only plugs I have ever run and I've yet to have any interference with any electronics. I guess most are far enough away to not affect it, since most of the head units are all the way in the cabin.
Eddie

crapr6

Thanks for the reply. I'll take a look at them NGK's
Erik