Check out the installation guide here: https://highhorseperformance.com/installing-your-hhp-psi-spring-kit/
In order to run the higher lift VVT 5.7L, 6.2L and 6.4L HEMI camshafts, you will need to upgrade your stock valve springs.
This package comes with everything needed to plug-n-play the valve spring upgrade on VVT cylinder heads.
Contains:
PSI LS1515ML Valve Springs,
Manley 23629-16 Retainers for 6.2L Hellcat / 6.4L / 5.7L
Manley 23622-16 Retainers for 6.2L Redeye/Demon
6.2L and 6.4L require shims (no shims required for 5.7) 24 shims in total: 1 Thick Shim & 1 Thin Shim on Intake, 1 Thick Shim on Exhaust. Installed height is 1.950".
If you have further questions, or would like to place an order, please email sales@highhorseperformance.com or call us at 888-894-1115 M-F 9am-6pm est
