Correct spark plug on ADA head for SJ

[AdamOntario]

What is the correct spark plug for a stock 701 engine with the ADA girdle head along with 37cc domes. The rest of the setup is:

Riva freeride dry pipe, ported carbs, carbon fiber reeds, reed spacer, reed stuffers, concord 13/17 cutback, work grate and UMI rideplate, Freestyle cone.

The whole thing will be running on 91 octane, in ontario (canada )

If you are recomending something different from stock equivelent, please elaborate.

Thanks,
Adam

[Brooks]

BR8ES should be fine.

[AdamOntario]

I thought the stock one was NGK B7HS, I understand the R is for resistance but the # 8 you recomended is it because the heat range will be different on a head with 170# of compression?

[SRE]

The #8 is one heat range cooler. This is a safe choice when runner higher compression and an aftermarket pipe. Too hot of a heat range on the plug can lead to pre-ignition problems.

[AdamOntario]

Thanks, thats the answer I was looking for (I was 99 % sure, but not 100%)

Thanks,
Adam