Spark plug gap
 

What would be the correct gap on a 454 with dart iron eagle heads and holley 750? I'm using AC delco plugs. Thanks

My best guess is .035

If you dont have MSD or like ignition leave it at .035.

Set your timing around 30 to 32 degree's.

John S.:D

As far as anti-sieze, just a touch of it on the threads will do. What ever you do, do not use grease.

What plug # are you using ?

What should your gap be when using MSD?

With an MSD or Crane box you can get away with .038 to .040 on the gap. The plugs seem to last a little bit longer with the larger gap. At .035 they seem to burn up faster.

John S.:D

In reference to a Crane ignition box---don't quote me, but I think it says in their manual they recommend a .045" gap on a spark plug using their Hi-6M ignition box with their PS-92 coil. Whether a .045" gap is truly a good place to gap it at I really don't know.

With a high output coil, you should be able to run a .45 gap.

I've run our 1200 Cobras at .045 when we got them back from Randy and the plugs would foul and wear out quick. I tightened the gap up to .040 and got double the amount of hours out of them. Just my personal experience. A lot of other people will tell you the same as you also.

John S.:D