what autolight plug for scj heads?

What plugs are needed to run with scj heads with flattop 460 running 94 and 110 fuel. Searched but couldnt find any info.
Thanks

I'm thinking we used a 25 once, but not 100% on that. You could go to Autolite's website and find part # for stock replacement and go from there.

do they use a tapered or gasket style plug and what is the reach? These are the kaase design scj aluminum heads.
Thanks

Lem told me to use ar3923

stanggt wrote:What plugs are needed to run with scj heads with flattop 460 running 94 and 110 fuel. Searched but couldnt find any info.
Thanks

Presumeing that you were talking about the FRPP aluminum SCJ heads and not the OEM iron heads...

With a flat top piston you can run an extended tip spark plug #AR3911; (same heat range as a AR3934 but has an extended tip).

Ar 3934 is what Lem told me for my setup 472'' & flat tops with aluminum scj's

Tennessee Bullitt wrote:Lem told me to use ar3923

For street/strip engines........use 3934/3933 for track only .

what about running a 3932 for a 16:1 motor (without N20)? Or is the 3932 too cold of a plug?

psfracer wrote:what about running a 3932 for a 16:1 motor (without N20)? Or is the 3932 too cold of a plug?

At 16:1 the 3932 should work....I assume you have a butt kicking ign box........not hotter than the 3933 at that high ratio i.m.o.

MSD 7AL2 Plus and the MSD Pro Power coil.

It's gotta work.....that's the same ign. box KY Jelly has

Thanks for info, almost ready to fire it up.