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CP Performance Boaters Shopping and Product Info Guide
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Valve Cover Breathers

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Hardin Marine
2-Piece Valve Cover Accessories

valve cover accessories

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.

Part No. Description
620-154023 Filler Cap (2 required)
620-154022 Breather Extension (2 required)
620-154024 Large O-ring (for replacement between covers)
620-70153 1-1/2" Clamp-on Breather No Shield (each)
620-154025 Stainless Hardware Kit for 2-piece Covers
Keith Eickert
2-Piece Valve Cover Accessories

2 piece valve cover

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.

Part No. Description
755-8401 -20 Oil Fill Plug
755-8404 -20 Valve Cover Breather Extension
625-1282 Replacement O-ring
Hardin Marine
Valve Cover Vent Extension

Valve Cover Vent Extension

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

Part No. Description
620-70182 5/8" x 3/4" Valve Cover Vent Extension

Hardin Marine
Push-In Breather With Vent

Push-In Breather With Vent

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.

Part No. Description
620-70160 Valve Cover Breather

Crankcase Evacuation System
Pan E-vac System

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.

Part No. Description
655-6002 Pan E-vac System
Hardin Marine
Filtered Valve Cover Breathers

Filtered Valve Cover Breathers

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.

Part No. Description
620-70151 Push-in Breather No Shield (each)
620-70152 Push-in Breather with Chrome Shield (each)
620-70154 1-3/8" Clamp-on Breather No Shield (each)
620-70153 1-1/2" Clamp-on Breather No Shield (each)
620-68802 1-3/8" Dual Baffle Weld-in Breather Extension
Hardin Marine
Tall & Short Aluminum Valve Cover Breathers

Valve Cover Breathers

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".

Part No. Description
620-45756 2-3/4" Short Aluminum Breathers (each)
620-45757 4" Tall Aluminum Breathers (each)
Hardin Marine
Burn Down Valve Cover Breathers

burn down breather

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.

Part No. Description
620-45758 Burn Down Breather (each)
550-991922 -16 To -10 Adapter Fitting (each)
550-991923 -16 To -12 Adapter Fitting (each)
Hardin Marine
Extreme Valve Cover Aluminum Breather

Extreme Valve Breather

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.

Part No. Description
620-45760 Extreme Valve Cover Aluminum Breather
Hardin Marine
Billet Aluminum Valve Cover Breathers

billet breathers

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.

Part No. Description
620-45759 Billet Breather (each)