Valvetrain Components

GSC Power-Division makes traditional exhaust valve guides that fit properly, easier to install and shaped to help air flow instead of just copying the OEM design. GSC's Subaru EJ20 / EJ25 exhaust valve guides are made from true C67410 Manganese Bronze...

GSC Power-Division valve guides with depth stop fit properly, are easier to install and shaped to help air flow instead of just copying the OEM design. GSC's valve guides are made from true C67410 Manganese Bronze and turned on a dedicated precision CNC...

GSC Power-Division makes exhaust valve guides that fit properly, easier to install and shaped to help air flow instead of just copying the OEM design. GSC's Subaru EJ20 / EJ25 exhaust valve guides are made from true C67410 Manganese Bronze and turned on...

GSC Power-Division makes valve guides that fit properly, easier to install and shaped to help air flow instead of just copying the OEM design. GSC's valve guides are made from true C67410 Manganese Bronze and turned on a dedicated precision CNC turning...

GSC Power-Division makes exhaust valve guides that fit properly, easier to install and shaped to help air flow instead of just copying the OEM design. GSC's Subaru EJ20 / EJ25 exhaust valve guides are made from true C67410 Manganese Bronze and turned on...

GSC Power-Division valve guides with depth stop fit properly, are easier to install and shaped to help air flow instead of just copying the OEM design. GSC's valve guides are made from true C67410 Manganese Bronze and turned on a dedicated precision CNC...

GSC Power-Division makes Subaru FA20 exhaust valve guides that fit properly, easier to install and shaped to help air flow instead of just copying the OEM design. GSC's WRX, BRZ / FR-S exhaust valve guides are made from true C67410 Manganese Bronze and...

VALVE GUIDES BC premium valves guides are made from Manganese Silicon Aluminum Bronze alloy and CNC machined to exacting tolerances. BC guides are resistant to cracking and corrosion, while reducing friction and insures high lubrication even at elevated...

VALVE GUIDES BC premium valves guides are made from Manganese Silicon Aluminum Bronze alloy and CNC machined to exacting tolerances. BC guides are resistant to cracking and corrosion, while reducing friction and insures high lubrication even at elevated...

Stainless Steel Construction: Both exhaust (XH-426) and intake (NK-842) valves are constructed from high-quality stainless steel for unparalleled durability.Chrome Stems and Hard Tips: Chrome stems and hard tips are incorporated for enhanced longevity...

GSC P-D Subaru/Scion BRZ/FR-S FA20 21-4N Chrome Polished Intake Valve - 35mm Head (STD) - Single

GSC P-D Subaru/Scion BRZ/FR-S FA20 Chrome Polished Exhaust Valve - 29mm Head (STD) - Single

GSC P-D Subaru EJ20/EJ257 Turbo Chrome Polished Super Alloy Exhaust Valve - 33mm Head (+1mm) -Single

GSC P-D EJ series EJ205/EJ207/EJ257 Chrome Polished Super Alloy Exhaust Valve-32mm Head(STD)

GSC P-D Subaru EJ205/EJ207/EJ257 Chrome Polished Intake Valve - 37mm Head (+1mm) - Single

GSC P-D Subaru Subaru EJ205/EJ207/EJ257 Chrome Polished Exhaust Valve - 33mm Head (+1mm) - Single

GSC P-D Subaru Subaru EJ205/EJ207/EJ257 Chrome Polished Intake Valve - 36mm Head (STD) - Single

Manley Subaru WRX EJ205/STi EJ257 33mm Race Master Exhaust Valves (Set of 8)

Manley 00-03 Subaru WRX (EJ20) / 04 STi Exhaust 32mm Stainless Race Master Valves

Manley 00-03 Subaru WRX (EJ20) / 04 STi Exhaust 32mm Stainless Race Master Valve (Single)

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: IntakeHead Diameter: 37mmStem Diameter: 6.0mm/...

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: 33mmStem Diameter:...

Manley Race Flo 36mm 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: IntakeHead Diameter: 36mmStem Diameter: 6.0mm/...

Manley Extreme Duty 32mm 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: 32mmStem Diameter:...

Manley 00-03 Subaru WRX (EJ20) / 04 STi Exhaust 32mm Stainless Extreme Duty Valve

GSC set out to create the best performance, longest lasting Subaru oversize (+1) 37mm intake valves available to the aftermarket. Using advanced 3D design and simulation programs GSC created a stronger and higher flowing valve head design. GSC flow tests...

GSC set out to create the best performance, longest lasting Subaru intake valves available to the aftermarket. Using advanced 3D design and simulation programs GSC created a stronger and higher flowing valve head design. GSC flow tests prototype valve...

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 33mm +1 Oversize Super Alloy Exhaust valves have chrome polished stems to create a smooth, durable finish for added life and better lubricity especially when...