Zerx fittings
They have a llittle spring loaded one way ball valve that lets grease in but not out. The pressure from the grease gun opens the valve to let the grease in. I guess they could be clogged up, but the ones I've seen have always worked.
Rev
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'66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi.
O.B.C. #2
'66 coupe
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