Spark Plug Modifications

katman · Post by **katman** » Tue Jul 12, 2005 4:29 pm

I've heard of people cutting the ground electrode off at the edge of the center electrode as opposed to going across the center electrode. Any comments good or bad? I've got a 79 Z28 359ci about 10.5:1, runs mid 12s. MSD Digital 6+, MSD billet distributor, MSD HVC II coil, MSD wires, Accel plugs .035. Normally Aspirated now going to install Nitrous Express 2 stage plate soon. Would this mod help? Should I increase the gap to say .045?

ChrisU · Post by **ChrisU** » Tue Jul 12, 2005 6:09 pm

There plugs that can also be bought that way, such as the Autolite racing plugs. It is suppose to unshroud the electrode. It's another flavor of the week in my opinion. Any benefit might be related to plugs position.

Grocerius Maximus · Post by **Grocerius Maximus** » Tue Jul 12, 2005 8:14 pm

I can say with utmost certainty that on the pentroof 4 valve boosted apps we work with, cutting the ground strap 1/2 way over the center electrode does in fact cure misfires w/o having to keep dropping the gap down when running high boost.

Ron C. · Post by **Ron C.** » Wed Jul 13, 2005 10:54 am

If your going to run nitrous, the autolite race plug would be a good choice. The ground strap is thicker and that is a plus with nitrous.