33-4250 Steel breather valve & spacer set. STD.

This S&S steel breather valve and spacer set is a high-quality replacement for late 1977 to 1999 Big Twin models, excluding Twin Cams. S&S has engineered this valve with elongated breather holes to increase the duration of the vacuum, which helps pull more oil from the cylinder heads—a benefit for both stock and large-displacement engines. The kit includes a spacer set to ensure you get the end play exactly right. Since 2000, S&S updated the timing on these valves to improve scavenging and reduce oil carry-over, making this a smart performance upgrade for any Evo or late Shovelhead build.