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The RS657 is one of Zipper’s most popular big lift grinds that dramatically improves torque over competitors high lift cams while sustaining excellent peak power.

This cam is widely used in many performance engines and is standard equipment in select Zipper’s Performance Muscle Kits. The RS657 is everything you expect from Red Shift Cams® – broad power, great performance with excellent valve train dynamics-control.

Heavy duty Valve Springs are required on most all applications, yet the RS657 cam can be a bolt in to H-D 120R engines for a dramatic increase in power.

Contact Zipper’s for assistance on valve spring options- recommendations.

  • Requires adjustable or cut to fit pushrods
  • Available in chain & gear drive for Early and Late model engines
  • Chain drive- Use Red Shift Cams® Dual Piston Cam Chain Tensioners (#413-901) for improved cam chest component reliability, maximum throttle response and reduced valve train noise.
  • Use 07- Up part number for 2006 FXD engines
  • New cam bearings and performance tappets are required.

DOCUMENTS & DOWNLOADS

Red Shift® Cams Catalog
Red Shift® Twin Cam® Cams Fitment Matrix
Red Shift® Cam Twin Cam® Installation Guide
Rogue’s Red Shift® Cam Install Article – Bikernet

 

Not legal for sale or use in California on any pollution controlled motor vehicle.
Not legal for sale or use on any EPA pollution controlled motor vehicle.

Weight 1 lbs
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1 review for Red Shift Cams® RS657 for Twin Cam®

  1. classicsnrods

    Im very surprised there is no review for this awesome cam !! I did a performance 107” Zippers kit on my 2001 FXD Super-glide years back. When I say kit that means all the guess work is taken out by Zippers it’s a perfect matched kit with the ultimate performance for your street hot rod. This cam pulled hard through the hole power band and made just over 120 TQ. and HP. I have purchased odds and ends from Zippers through the years and their customer service is excellent and if they didn’t have answers right away they got right back to me. Thank you for your service! Johnny

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