Valvetrain Components

GSC's set out to create the best performance longest lasting valves available to the aftermarket by using advanced 3D design and simulation programs they created a stronger and higher flowing valve head design. GSC flow tested prototype valve heads in...

Running high horsepower with high EGT's requires a valve that will last in 2000F conditions. GSC 32mm standard size Super Alloy Exhaust valves have chrome polished stems to create a smooth, durable finish for added life and better lubricity especially...

Manley Race Flo 37mm Intake Valve Set For Subaru WRX / STI (8). Manley Intake valves are made from NK-842 Stainless, are Swirl Polished, Fully Machined, feature Chrome Stems and Hard Tips.Type: Intake Head Diameter: 37mmStem Diameter: 6.0mm/...

GSC's set out to create the best performance longest lasting valves available to the aftermarket by using advanced 3D design and simulation programs they created a stronger and higher flowing valve head design. GSC flow tested prototype valve heads in...

GSC's set out to create the best performance longest lasting valves available to the aftermarket by using advanced 3D design and simulation programs they created a stronger and higher flowing valve head design. GSC flow tested prototype valve heads in...

Manley Extreme Duty 33mm Exhaust Valve Set WRX / STI (8) . Manley valves are made from an ExtremeAlloy XH-426 Stainless. The valves feature swirl polishing, are fully machined with chrome stems and hard tips.Type: exhaustHead Diameter: 33mm Stem...

GSC Power-Division 6mm Viton Valve Stem Seal set for the Subaru EJ257, EJ207 and EJ205. GSC's Viton stem seals are able to cope with higher heat than the OEM seals which reduces wear in and tear in performance engines.Fits: Subaru EJ205 / EJ207 / EJ257...

GSC P-D 4G63T Evo 4-9 OD .4750in ID .2598in OL 1.950in Exhaust Valve Guide - Single

Killer B Fumoto Quick Change Valve 16mm-1.5