Edelbrock part #4213 Billet Polished Aluminum push in Breather fits all standard 1.25 valve cover holes. The top of the breather un-screws from the base for access to the foam insert. Breather is round and is 2.480 at the base and 2.350 at the top. Ove Product Features:1.75 in. HeightVictor SeriesPolished Housing Color0.96 in. Stem Outside DiameterPush-in Mounting Type