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Wednesday 31 January 2024

Feuling Parts

M-8 Cylinder Head Breather

Harley may have dispensed with the cylinder head breather on its new design of VVT CVO heads, but in all likelihood, it will be some time before its new engine tech makes its way into the mainstream Softail and Touring models (if at all).

Oceanside, California headquartered Feuling Parts' new Feuling cylinder head breathers for M-8 engines are CNC-machined from billet 6061 aluminum with square surfaces, promoting excellent umbrella valve sealing. 

Longer main breather exit nipples with dual O-rings to promote better breather system sealing and properly sized breather inlets and location mean optimum engine breathing - the unique design maximizes breather volume and allows for easy serviceability. 

The breather bodies have multiple drain ports located on the inside floor and the ports are chamfered on ID to allow easy drainage, yet are squared off on the exits to deter filling from splash oil. Anodized in Feuling Red, the kits include the billet breather housings, billet covers, breather filter elements, umbrella valves and quality hardware.

CEO Luke Leatherman says that its breathers "work, seal and hold an engine vacuum. Testing shown on a healthy, sealed engine without external venting via the dipstick or transmission top cover will see 3-4 oz of oil in the sump, and once the dipstick is removed, another 3-4 oz will drain.

"These breathers can be used with external venting via dipstick, transmission cover and air cleaner and are a stock replacement for Touring and Softail M-8 engines - rocker cover gaskets will need to be additionally purchased; one-year warranty available."