Gaz64, The plugs have just under 1,000 miles on them. They were installed with the new aluminum heads. The heads were complete so all new valves, springs, etc. The only parts added were new roller rocker arms. The carb is a Holley 4160, 600 cfm, elec choke, vac secondaries. I bought the Mustang 9 yeras ago and completely restored it from the ground up. I had the engine rebuilt at during the restoration since I had it out of the car at the time. The engine builder said the engine was in good condition but we changed the pistons, rings, cam, bearings,
oil pump, etc, etc. I installed the new Holley when the engine was put back in the car.
Jay Mac, the #1 cyl had the worst valve guide and of course #1 is the easiest plug to pull on an old Mustang. The engine was using about 1 qt of
oil per thousand miles so it wasn't really a lot. The engine did not take any
oil (or anti-freeze) since the aluminum heads were installed this past spring.
Dwight, I am going to take a look, maybe I will learn something.
Thanks all.