Valves

Intake and exhaust valves open and close the ports in the cylinder head. They let the air-fuel charge in and exhaust gases out, and they seal the combustion chamber the rest of the time. This collection covers aftermarket replacement valves, including the GSC Power-Division range, for engines such as the Nissan RB26DETT and VR30DDTT, Subaru FA20F, FA24F and FA24D, Toyota G16E-GTS, Ford 5.0L Coyote, Audi/Lamborghini 5.2L V10 and Porsche 991.1 Turbo and 992 GT3. Valves are part of the wider Engine Internals range.

Shop by Product Type

A valve is one part of the valvetrain. Browse the related components:

Choosing the Right Part

Engine code: Valves are listed by engine, for example RB26DETT, VR30DDTT, FA20F, FA24F, FA24D, G16E-GTS or Ford 5.0L Coyote. Some Coyote valves are listed for specific engine versions, so check that the version in the listing matches your engine.
Intake or exhaust: Intake and exhaust valves are separate parts with different head diameters. Each listing states which one it is.
Head diameter: STD valves match the standard head size. Oversize options such as +1mm or +0.7mm are larger and are intended for cylinder heads machined to suit.
Overall length and tip: Some listings state an overall length or an extended tip, such as +1.5mm. Match this to your valvetrain setup.
Material and finish: Titles show the material designation where supplied, such as 21-4N, 23-8N, Alloy or Super Alloy. They also show the finish, such as Chrome Polished. Check the product page for the manufacturer's details.

Installation & What You'll Need

Fitting valves involves removing and machining the cylinder head. This includes preparing the valve seats and setting installed heights. Installation by a professional is recommended. Ask your engine builder whether your existing springs and retainers, keepers, stem seals and guides suit the new valves, and replace gaskets as needed.

FAQ

What is the difference between STD and +1mm valves?

STD valves have a standard head diameter. +1mm valves have a head 1mm larger and are meant for cylinder heads machined to suit.

Are intake and exhaust valves interchangeable?

No. They are separate parts with different head diameters, and each listing states whether it is an intake or exhaust valve.

What do 21-4N and 23-8N mean in a product title?

They are the material designations listed for that valve. Check the product page and the manufacturer's information for details.

Do I need other parts when replacing valves?

Often, yes. Ask your engine builder whether your springs, retainers, keepers, stem seals and guides suit the new valves.

Need help choosing? Contact our team at sales@chicaneaustralia.com.au.