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08-10 STI GSC Valve Train Components

Standard and Oversize Valves

When GSC set out to create the best performing and longest lasting valves available, they knew they would need to turn to the cutting edge of design technology. All GSC Power-Division performance valves are created with advance 3D design and simulation programs, resulting in a stronger and higher flowing valve head concept. All prototype valves are precision tested against the competition to ensure the highest performing design available. Higher quality materials mean less head distortion for better sealing under extreme conditions and more consistent performance through the life of the valve.

Features:
Swirl polished heads
Back cut for added weight reduction at high rpms
Micropolished valve stems for less drag and smoother motion
Fully nitrated for a reduction in carbon buildup
21-4n stainless intake valve material
23-8n stainless exhaust valve material
Compatible with OEM keepers/locks

FITMENT:
Subaru STI 2008-2010

Description	Part #	MSRP	Price	Inventory
32mm (STD) Exhaust Valves - Set of 8	2011-8	$131.77	$114.58	Ships from factory in 1-3 days
33mm (+1mm) Exhaust Valves - Set of 8	2013-8	$131.77	$114.58	3 available
36mm (STD) Intake Valves - Set of 8	2012-8	$132.94	$115.60	Ships from factory in 1-3 days
37mm (+1mm) Intake Valves - Set of 8	2014-8	$132.94	$115.60	4 available

Beehive Valve Springs

Stage 1 Single Beehive valve spring set for the STI uses the factory spring seat and the factory retainer. This is a great option for those wanting to run GSC S1 or S2 camshafts on a street application, or anyone wanting to run more lift for high RPM power gains.

Notes:
Full set of 16 valve springs.
Rev. limit: 9,000RPMS

FITMENT:
Subaru STI 2008-2010

Description	Part #	MSRP	Price	Inventory
GSC Spring and Retainer Kit - full set of 16	5043	$425.21	$369.75	4 available

Valve Stem Seals

GSC Power-Division Viton Valve Stem Seals for the STI include the entire 6mm valve size seal set (8 intake and 8 Exhaust)so you will have no guess-work when it comes to installation. These stem seals are an upgrade from the standard OEM material to help cope with the higher heat caused by high performance Subaru EJ engines.