MMR Gen 2 / 302XR Race Spring & Retainer Kit - 2011-2017 Mustang GT 5.0L
The MMR Gen 2 / 302XR Race Spring & Retainer Kit is built for serious Coyote performance, delivering the strength, stability, and durability needed for high RPM race applications. Designed as a direct replacement and upgrade for 2011-2017 Mustang GT 5.0L engines, this kit supports camshaft lifts up to .600" and offers 10,000 RPM potential.
Tested by MMR and proven in record-setting Coyote combinations, this spring and retainer package is engineered for extreme racing use, including road racing, high horsepower drag racing, and ultra high RPM applications. Whether you are upgrading a standard GT or Boss-style valve spring setup, this kit provides the valvetrain control needed for demanding performance builds.
Features
- Gen 2 / 302XR race spring and retainer kit for 5.0L Coyote engines
- Supports camshaft lifts up to .600"
- 10,000 RPM potential for extreme race applications
- Includes 32 titanium retainers
- Includes 32 beehive-style super finished and shotpeened springs
- Works with all valves and valve locks
- Direct replacement and upgrade for Boss and standard GT models
- Designed for road racing, drag racing, high RPM, and high horsepower use
- Cam limiters or MMR phaser adjusters are recommended
- For installation, use MMR spring compressor PN 451564
Fitment
- 2011 Mustang GT 5.0L
- 2012 Mustang GT 5.0L
- 2013 Mustang GT 5.0L
- 2014 Mustang GT 5.0L
- 2015 Mustang GT 5.0L
- 2016 Mustang GT 5.0L
- 2017 Mustang GT 5.0L
Additional Notes
- Cam limiters or MMR phaser adjusters are recommended.
- Works with all valves and valve locks.
- MMR does not publish spring specifications to protect their research and testing.
- Recommended installation tool: MMR spring compressor PN 451564.
*ALL CANCELLED MMR ORDERS ARE SUBJECT TO A 15% CANCELLATION CHARGE. ALL MMR ORDERS WILL BE QUOTED WITH AN ESTIMATED LEAD TIME UP FRONT, AND ACCEPTING THIS LEAD TIME ALSO MEANS YOU AGREE TO CANCELLATION CHARGES OF 15%. THIS COVERS CREDIT CARD OR PAYPAL FEES, AND THE 10% MMR CANCELLATION FEE. IN ADDITION MMR CONSIDERS THEIR PARTS RACE PARTS AND THEY DO NOT ACCEPT ANY RETURNS ON ANY ITEM THAT THEY SELL.
CA Residents: WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov
