Cardiac Surgery for Your Twin Cam®! Just as the human body requires a proper supply of blood for a long and healthy life, so does your Twin Cam® – except instead of blood, it’s oil that that your overworked air-cooled engine demands to keep the miles and smiles coming. Zipper’s cam chest upgrade kit addresses many weak areas of the factory system by using components made from higher quality materials with design improvements that ensure critical engine parts get the lubrication and protection they need, while improving performance and engine noise levels.

Central to this system is our Billet Cam Plate with its blueprinted oil distribution method. By using dense, high strength billet aluminum as the parent material of the plate, porosity voids (casting pits and holes) that are present in the original cast part are eliminated, stopping the internal losses that contribute to low oil pressure and low volume. The oil pressure bypass valve located within the plate, which is critical for maintaining idle and low-RPM oil flow to all high pressure surface areas of the engine, is concentrically ground to provide a true seal when closed; each bypass valve is hand-fitted to the plate, pressure tested and documented by Zipper’s skilled technicians.

In concert with our blueprinted cam plate, Zipper’s patented dual-piston hydraulic cam chain tensioners are included to further improve internal oil pressure, cam timing accuracy, cam chain control, noise and performance. Quality lifters are also a must when upgrading; these kits include USA-made Feuling lifters. Each kit also includes a 2007-up style oil pump with increased feed and scavenge capacity, a set of USA-made Torrington/Koyo full-compliment inner cam bearings, and a cam chest gasket set. These top-shelf components increase durability and life, and are a must when performance cams and related parts are added to your engine.

Available for all 2007-2017 Twin Cam® engines as well as 1999-2006 engines (hydraulic conversion). The components of these kits can be purchased whole or in part; please contact us with your requests.

Weight 1 lbs

Engine Type

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