my boss has a 72' chev with a 327 in it. he went to the parts store and bought an HEI about 6months ago and i converted it over for him. it runs great but every month or two it wont sart, i have to pull the cap off and wipe a bunch of dust and scrape crap off the contact points inside the cap. then it runs great again. he called me this weekend and i went over, sure enough it needed cleaned again.....well got it all cleaned up and no spark? wtf? so what is causing all the crap to form in there? i know its not normal.....ive never had this prob in any of my other hei's.