Helping a buddy and i’m kinda scratching my head.
The plugs we pulled out of the car are PFR6A-8, i took a look on the Champion website and it kick out a couple of NGK plug numbers: PFR6A-11 and another -11 number. What i’m scratching my head about it if the -11 plug numbers will run to hot considering we pulled -8 out of the engine. Any help from the skyline boys would be very helpful.
You pulled out a 6 heat range plug,the 11 indicates gap. Just get the same number plug, you can go with the -11 and just gap it down to .8. Sometimes you may be able to find a plug that doesnt even have the -11 at the end, again you would have to gap them your self.