plugs for GN1R heads

[hwholder]

what plugs and gaps are you guys using on GN1R heads for race application and 25+ lbs of boost?

 

[TurboBuRick]

Some of the more popular choices are

Autolite 103's

Ac delco r42lts

ngk tr6

Gap .030

 

[DR BOOST]

i believe a gn1r head uses a smaller plug than a gn1.

i have the part number written somewhere if i can find it.

 

[hwholder]

I used Autolite 104 in my GN1 heads with great success. However, when I got my new GN!R heads the plug hole is 12 mm instead of 14 mm. The reach is .75 and it requires a gasket type plug, not a tapered plug like the Autolite 104 for the GN1 head.

I searched for a rather cold resistor type plug that would meet the dims and could not find one other than an $86/each NGK exotic plug.

I found an Autolite AR 4132 plug that meets the physical dims and is a rather cold plug, but it is a non-resistor type.

I use XFI and a MSD 10 Plus box with a distributor and Magnecor wires.

Does anyone think my electronics will be plagued with EMI using the non-resistor plugs?