L31MaxExpress
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They were once brass terminals with low resistance brass buttons. The last one I bought had the standard aluminum garbage and I returned it.What is so special about the "Mercury" or "Quicksilver" distributor cap? Currently $87 on Amazon. I think $87 is nuts, I'd resent paying that for a Jaguar V12 cap, never mind one to fit a Chevy.
www.amazon.com/QuickSilver-8M6001106-1-Distributor-Cap/dp/B00A83QSXC/ref=sr_1_2?crid=2PEFTKI9RSMGK
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At least with the United Motor Products unit, you can say it has a vent on the top.
The only Vortec cap and rotor I will run is MSD as they are the only ones I have had that will last. With the distributor base vacuum vented and resupplied with filtered fresh air from the airbox to continuously eliminate moisture and ozone buildup they last for years.