M8 Valve Spring Kit — High-Performance Valve Train Upgrade
Engineered for reliability under high-lift applications, this complete valve spring kit delivers everything needed for a proper valve train build on 2017–2026 M8 engines (non-VVT).
 
What's included:
PSI Valve Springs — rated up to 0.640" lift, precision-wound for consistent seat and open pressures across all cylinders
JHE Titanium Retainers — exclusive to this spring design, reducing reciprocating mass for improved high-RPM stability and longevity
Triple Groove Locks — positive retention engineered to match the retainer and spring geometry
Lower Collar with Valve Seal — complete lower end hardware included, no additional sourcing required
 
A high-performance valve spring kit is required for all M8 Star Cams EXCEPT the M8 30/30 and the M28 on Gen 2 engines.