Valve Cover Breathers

Below you will find the components used in the popular Hardin marine 2-piece covers. The caps and extensions are CNC machined from billet aluminum and both seal with an o-ring.

Below you will find the components used in the popular Keith Eickert 2-piece valve covers. These are CNC machined from billet aluminum and hardcoat anodized black. Both seal with an o-ring.

This gold irridited valve cover vent extension is commonly used to vent crankcase emissions to your flame arrestor

These popular breathers are used when you would like to vent the crank case to another location such as the flame arrestor or vac-u-pan. This unit is used on many MerCruiser hi-performance applications. Push in has a 1" hole and has a 5/8" vent hook-up.

Designed primarily for drag and circle racing. This system is designed to reduce pressure build-up in the engine crankcase and to reduce oil leaks, while increasing engine performance. Track and dyno tests show significant horsepower increases. Includes 2 each: oil separator Small Block breathers, breather/filler cap, grommets, one-way check valve and weld-in nipple for header collector.
Note: Not recommended with mufflers.

These breathers feature maximum flow and protection from airborne elements. They are used on most Hardin Marine valve cover systems. These breathers are easily washable for service.

These breathers are designed to mount to the top of the valve cover with no bolts exposed. Each breather is highly polished. Short breathers are 2-3/4" tall while Tall breathers are 4".

These baffled burn down style breathers got their name because they are traditionally used to route crankcase pressure to the exhaust system. Today they are commonly used to route to a puke tank. These breathers feature a -16 thread for ease of plumbing. Fittings sold separately.

Finally a new modern styled breather is available. Hardin Marine introduces a breather to match the ever popular extreme series valve covers. The top of the breather is sloped to match the styling of the valve cover while integrating dual internal baffles, there's never any foam to replace.

These aluminum valve cover breathers are so nice they could be jewelry for you engine. Each breather is precision machined from solid billet aluminum. Their height matched with dense foam packing work well to keep blow by to a minimum.