SKU: FED211032
MPN: 211032
The Frankenstein Engine Dynamics Swivel Breather Assembly (MPN 211032) is a screw-in crankcase breather built for high-performance engine builds that need controlled crankcase ventilation. It pairs a 16an male O-ring inlet with a -12an male evacuation outlet, giving builders a clean way to route crankcase pressure into a catch can, vent line, or evacuation system. This is a part for engine builders, racers, and shop techs spec'ing out a ventilation setup rather than a casual bolt-on buyer. It fits into the broader family of oiling systems components we stock for serious motors.
The body is machined from aluminum and offered in black anodized or natural finish, keeping weight low at the valve cover or vent port. The 16an inlet uses an O-ring boss thread, so it seals against a flat-bottom port without tape or sealant and resists backing out under vibration. The -12an evacuation outlet sends crankcase pressure downstream through a -12 line to a catch can or vacuum source. The swivel design lets the outlet rotate after installation, so the line can be aimed away from headers, linkage, or other hardware without fighting thread clocking. It ships as a single unit. Builders running this style of breather typically pair it with matching push-on breathers or a dedicated evac check valve elsewhere on the engine.
This breather earns its place on engines where crankcase pressure has to be managed deliberately, drag motors, circle track builds, and street cars running a sealed catch-can loop. The O-ring boss inlet threads into a tapped valve cover or vent bung, while the -12an outlet carries vapor away from the crankcase. The swivel outlet makes routing easier in tight engine bays where a fixed fitting would point the line into something it shouldn't. If you're building out a complete ventilation setup, look through our engines and components selection for catch cans, check valves, and the fittings to tie it all together.
The inlet is a 16 AN male O-ring boss thread. It seals against a flat-bottom O-ring port using the captured O-ring rather than thread tape or sealant, which makes it resistant to backing out under engine vibration. The port in your valve cover or vent bung needs to be machined for a 16 AN O-ring boss fitting.
The swivel lets the -12an outlet rotate after the breather is threaded in. That means you can clock the evacuation line away from headers, linkage, or other hardware without having to fight thread alignment or risk under-tightening the fitting to get the outlet pointed where you need it.
The -12 male evacuation outlet is sized to carry crankcase pressure and vapor downstream through a -12 line. Builders typically route it to a catch can, vent tank, or a vacuum/evacuation source depending on the engine setup.
It is machined from aluminum and offered in black anodized or natural finish per the available specifications. Aluminum keeps the part light at the valve cover or vent port while standing up to underhood heat and the corrosion exposure that comes with crankcase ventilation duty.
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