GSC Single Valve Spring and Ti Retainer Set FA EJ20X Fitment note: BRZ models use

Fitment note: BRZ models use in 3 locations only (RH/LH Intake

The studs are undercut to more effectively compensate for head gasket compression

Rod Bolts = ARP L19 3/8in / ARP CA 625+

After brake line kit installation the system will require the brake fluid reservoir to be refiled and air bled from the system

GSC Single Valve Spring and Ti Retainer Set FA EJ20X Fitment note: BRZ models useKEEP YOUR VALVES UNDER CONTROL GSC's singe cylindrical valve spring kit is their entry level performance valve spring option at an economical cost. The lower open pressure is ideal for milder cam options and or less extreme rpm conditions.. Upgraded valve springs are essential for controlling valve movement with more aggressive cam profiles. A higher spring rate is also necessary under high boost conditions due to the manifold pressures acting against