Here is what I have. 15.25/1 compression methanol fueled , 550 cubic inch with 572=13 heads. I have 8 mm morose wires, a stock cap and rotor, Ngk5672-9 plugs gapped at .025. On the dyno the motor was miss firing. We leaned it out some and the miss fire went away. We only had to lean it out between five and ten percent to get a good clean pull on the dyno. So knowing that it didn't take an extremely rich mixture to start miss firing, my question is,, what is the weakest link? The ignition is a new MSD7531 programmable 7 and when Iusing a test box, really sounds good. So what may be the weakest link in my package? After proper jetting, it made 982 hp, so power is good. I am just concerned about being so close to miss fire.

Did you have 02's and or exhaust temp sensors on the engine during the pulls? Others may be better at it but I have always had a hard time reading plugs in an alcohol engine. And you are right normally methanol has a broader flammability range than gasoline. you said you leaned it a little and the missfire went away, did you try and lean it more? I try and lean until the exhaust temps start to rise.