Burning out Chevy HEI Ignition modules

[Stephen Roy]

My S10 had a 305 in it and I never replaced the ingnition module. When I dropped my 350 in I used the same distributor. Within the year I replaced 3. I noticed the old distributor harness & wiring were getting birttle, so I dropped in a new Mallory Distributor in it. Its been 9 months now and last week I had to replace the module that came in the new distributor. The distributor came with the coil & other HP parts. When I replaced the Module I checked the cap. There is no corrostion on the rotor or terminal in the cap, but there is a brownish black sout inside the cap and on the rotor. What is causing this problem? And are they related. Somebody told me heat kills the module but what causes the suot. Stephen Roy new E-mail address srsv8dime@bellsouth.net Thank you.