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distributor cap corrosion build up?

brans87

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Wondering where do you drill the hole/holes in the distributor cap to help with the build of of corrosion on inside of cap? Pictures would be nice. 87 K5 350 tbi if need the info.
 
FWIW GM did this on the TPI distributors (if not others), here is a pic to give you an idea of where that vent was: http://www.autopartsdb.net/assets/images/ProductImg/C/CD804.jpg

Personally if I was drilling one out, I'd either make the holes absolutely tiny, or epoxy a piece of screen over it...wasps and the like seem to be really good about finding holes to plug up with mud.
 

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