GSC Power-Division Spring Seats are now available for the Subaru Turbo EJ series. The GSC1005 is an OEM replacement stamped spring seat, useable with...
GSC valvetrain components are created using the world's most advanced design, FEA, and flow simulation softwares to aid with real world performance testing. Our...
GSC Power-Division OEM Replacement Valve Spring Seat Set for 4G63T. Perfect for replacing old seats when upgrading to a high performance spring kit like...