Need a check on my Nitrous Barracuda setup

Brandt Fonda said

Is that NGK plug a good pick for my setup? The 9 is pretty cold compared to OE 14?

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I dont think champon to ngk heat ranges coincide. In NGK-ese a stock plug is xr5...colder is a xr7 as an example. 300 shot and we are in 11-12 heat range. Again this is NGK land. There must be a cross reference out there somewhere.