106-5070 Steel breather valve. STD

This S&S steel breather valve is a high-quality replacement for the standard breather in early Big Twin engines. S&S has engineered this valve with elongated breather holes, which helps increase the duration of the vacuum to pull more oil from the cylinder heads, improving overall scavenging. This is a standard-size valve that works perfectly in both stock and high-performance motors. It is important to remember that this steel breather must be used with steel breather valve spacers; do not mix it with plastic components. This valve fits 1936 to 1947 Big Twin models, including Knuckleheads and early Flatheads, and naturally replaces OEM number 25300-36.