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It’s going to be at risk of detonation anyway with all the oil in that cylinder- the oil drastically reduces the octane of the fuel. I run -6’s in my motor for street driving and -8’s when on nitrous. A -5 or -4 in that single cylinder isn’t going to be detrimental as long as you aren’t going...

x2 on the anti fouler. Just going up a heat range on the plug is not going to cut it, and a -5 NGK is the stock heat range, you'd need to go to a -4 at a minimum, but with all of the oil on that plug it isn't going to resolve it. The anti-fouler worked for me on a Pontiac 400 I had. The oil...