I gap my plugs at .040, someone suggested I gap them at 30. What do some of you all gap yours at. My Ign. is MSD, and I run AC R43TS, and Autolite AR25. Thanks

I gapped 'em at .030 when I ran points distributors. .045 with HEI. I've run my MSD as high as .055 with no issues, but it seems to run just as well at .045, so I keep it there.

The only reason I know of to run a high output ignition with a .030 gap is if you're running nitrous.

.040" should work well. The higher the CR and RPM the smaller the gap required. A high output ignition should be able to handle more but there is no advantage.

Pat I just installed a new ignition fron DUI Dave unified ignition/Performance Distributor. They said to run them at no less than .055 Hope this helps.Are you running points or HEI?
gary

Mallory unilite for awhile now. I usually set the plugs at 40, main reason I' asking I guess is because sometimes I get a fuel foul when I first crank the motor. It usually clears once the motor gets warm, but sometimes not, then i have to change the plug. I guess some may ask how do i find the fouled plug. Well the one thats fouled will have a cooler tube. So I take a plastic wire tie, any color will do and I touch nit to each tube. The one that does not melt is the culprit. I would not do this to pretty headers though.

Mallory Unilite,Blaster II coil, gapped at .035

Originally posted by Patrick O'Rourke:
Mallory unilite for awhile now. I usually set the plugs at 40, main reason I' asking I guess is because sometimes I get a fuel foul when I first crank the motor. It usually clears once the motor gets warm, but sometimes not, then i have to change the plug. I guess some may ask how do i find the fouled plug. Well the one thats fouled will have a cooler tube. So I take a plastic wire tie, any color will do and I touch nit to each tube. The one that does not melt is the culprit. I would not do this to pretty headers though. That's one way to find out which cylinder isn't firing. :cool:

A spray bottle with water works, too.

Or just spring for a Temp gun, they are cheap now & a really handy tool. ;)
You can check all kinds of neat things like oil temp, radiator, headers, the track, your
forehead,,,,,, :D
The list is endless,,

In my drive lately, wire ties have been handy, I am an AC guy so i have temp stuff, but by the time I would leave the car ,get the unit, i would have touched a wir tie to it and have the plug half changed, that is if I have my gloved in the car, if not I'll just set back watch the clouds and wait a few minutes.

Well I went out this AM to change plugs, not just the fouled one. So I got out my AR25's and started pulling plugs. I get to the one that was fouled and found out that it was a R43T and not an R43TS. Thats why it fouled. A S plug sticks out further into the compustion chamber. Oh well, I guess I'll learn one day to make sure I am putting the right plug in.