Where to gap plugs at?

[EMW150]

Keep them at .040 that should be good enough and keep you out of misfire.

I agree. I've never seen the benefit of gapping wide. There are alot of things to consider when you gap them other than just the ignition system. The main thing is cylinder pressure. The more you have the tighter you should gap the plugs. This means higher compression or aggressive ramped camshafts that build cylinder pressure. I run mine at .040. I'd say 92Stang302's combo would work well at about .045 /.050 at most.

 

[Michael Yount]

The bigger gaps suggested were specifically directed at 92Stang's naturally aspirated combo. The bigger the gap, the bigger the spark - that's the advantage. You are correct however - when boost or extreme cylinder pressures are involved, the gap usually has to come down to maintain spark integrity unless you've got enough ignition juice to run the wider gaps. As a practical matter on 92Stang's combo - .040, .050., .055......it probably won't make a whole heck of a lot of difference. Mine run at .054" with superb drivability and fuel mileage.

 

[jerry beach]

I run mine at .060, have for years with no probs. I have stock ignition, and agree that if you are NA then go as wide as you can for optimum burn.

 

[92Stang302]

i dunno guys, soon upper and lower manifold is going on but i put it at the gap the plugs that came out of the heads were when i bought it and its about a 42+ range right now w/ the new plugs, went for a ride banged the gears ran sweet. thanks for everyones input.