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Dress up your engine with this sharp looking, chrome-plated push-on oil breather...Mr. Gasket logo is embossed on top...This new cap is internally baffled and uses a high-porosity filter...Great for hi-performance use! Fits factory and after-market valve covers with 1.22" dia. hole. Replaces OEM-GM breather 6421868 on late 65-67 GM big block engines.