GSC Power-Division Beehive Valve Spring Kit for FA20 WRX-BRZ-FRS Breather Plumbing and Fittings This Block is rated to

This Block is rated to 750 BHP before adding upgrades

More durable design

Optional pressure relief valve porting

This means that it is suitable for turbo or supercharged applications running up to 3

GSC Power-Division Beehive Valve Spring Kit for FA20 WRX-BRZ-FRS Breather Plumbing and Fittings This Block is rated toMax RPM: 9,500 RPM Max boost: 35 psi Beehive Spring Coil Bind 0. 800 Install Height 1. 308 1. 315 Seat Pressure 89 87 lbs Open Pressure @ 11mm lift 231 lbs @ 0. 875" 229 lbs @ 0. 882" Maximum Valve Lift 0. 448 Includes: 16 Dual Springs 16 Spring Seat Locators 16 Titanium Retainers Beehive Spring Benefits: Rev faster Lighter components More durable design Less stress on valve train components Lower spring frequency for more precise valve control More