33-4263 Steel breather valve & spacer set. +.030" OD

This S&S steel breather valve and spacer set is a lifesaver for 1948 to early 1977 Big Twin models with worn or damaged crankcases. The valve is +.030" oversize, allowing a mechanic to re-machine the breather hole for a perfect fit using a standard reamer. S&S designed these with elongated breather holes, which increases the vacuum duration to draw more oil from the cylinder heads—a solid upgrade for both stock and high-performance Big Inch builds. Sold as a complete kit, it includes the necessary steel spacers to ensure you get the end play exactly right during assembly. It is a reliable way to restore proper engine breathing and oil scavenging on vintage iron.