Failure #2 of MSD distributor cap on FE ???

[afret]

Here read this thread:

332-428 Ford FE Engine Forum


The spring arm on the rotor in my Mallory distributor wasn't touching the carbon button on the cap (about a .05 gap) and this is how they looked after less than 100 miles:








Here's a picture of an unused cap:





I think the arcing between the carbon button and rotor wears the carbon out very quickly. In the above pictures you can see the pitting/burning of the contact arm on the rotor and the cratering of the carbon button.