33-4253 Steel breather valve & spacer set. STD.

This S&S steel breather valve and spacer set is a high-quality solution for managing crankcase pressure in Panhead and early Shovelhead engines. Sold as a kit, it fits 1948 to early 1977 Big Twins. The valve features S&S's signature elongated holes, which optimize the timing of the vacuum pulse to more efficiently scavenge oil from the top end. This design is beneficial for everything from stock 74-inch motors to large-displacement stroker builds. The kit includes a selection of spacers to ensure you can achieve the exact end-play required for smooth operation within the case. Replacing a plastic or worn steel breather with this S&S unit is a standard procedure for any mechanic looking to improve oiling efficiency and reduce leaks.