Quote:
Originally Posted by Geoff
Never understood the vented cap theory. Nothing inside the dist to cause moisture/rust, so no moisture to escape via a vent. Venting the cap will let moisture IN.
Factory dists do not have vented caps..........
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The point of the vent cap is to allow ozone (which is generated inside the cap from the extra high voltage ionizing the air) to escape. It is the ozone that oxidizes the inside of MSD distributors, not ambient moisture.
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule.
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