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Cylinder Bore Sizes = 86
Like most uprated mounts you should expect an increase in NVH making the car less comfortable to drive
The studs are undercut to more effectively compensate for head gasket compression
Valve Spring Specs (Standard/High Pressure):
Fitment note: BRZ models use in 3 locations only (RH/LH Intake
GSC Single Valve Spring and Ti Retainer Set FA EJ20X Cylinder Bore Sizes = 86KEEP 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
