Supertech Performance Valvetrain Components

Where to buy Supertech Performance in Australia: Chicane Australia sells Supertech valvetrain parts online, matched by engine code: Black Nitride intake and exhaust valves, Inconel and sodium filled Inconel exhaust valves in standard and oversize (+0.5mm to +1.5mm) heads, dual and beehive valve spring kits, manganese bronze guides, valve locks and stem seals. The range covers the Subaru EJ20 and EJ25 (WRX, STI, Forester, Liberty and Outback), the Honda K20C1 in the Civic Type R (FK8/FL5), the Mitsubishi 4G63 and the Audi 2.5T FSI (DAZA/DNWA). Supertech parts usually ship in 5 to 7 days, and we ship Australia-wide from the NSW Central Coast.

Supertech Performance makes valvetrain parts for high-RPM and high-boost engines, including one-piece forged valves, dual and beehive valve springs, manganese bronze guides, valve locks and stem seals.

Shop by Vehicle

Subaru EJ20 / EJ25 turbo (WRX, STI, Forester XT, Liberty GT): Black Nitride intake and exhaust valves, Inconel and sodium filled Inconel exhaust valves, dual and beehive spring kits from 64 to 100 lb, spring seat locators, guides, locks and seals. See Subaru Impreza WRX (GD), Subaru Impreza WRX STI (GD), Subaru Impreza WRX STI (GR), Subaru Impreza WRX STI (GV), Subaru WRX STI (VA).
Subaru EJ25 non-turbo (Forester, Impreza, Liberty, Outback, SOHC and DOHC): Black Nitride intake valves, Inconel exhaust valves and a 70 lb dual spring kit.
Honda K20C1: valve spring kit and springs, Black Nitride intake valves, sodium filled exhaust valves and stem seals for the Honda Civic Type R (FK8) and Honda Civic Type R (FL5).
Mitsubishi 4G63: Black Nitrided intake valve set of 8 in +1mm oversize for the Mitsubishi Lancer Evolution IV (CN9A) to Mitsubishi Lancer Evolution IX (CT9A).
Audi 2.5T FSI (DAZA/DNWA): intake and exhaust valve stem seals (set of 10), single groove valve locks (set of 20) and valve guides (set of 10) for the Audi RS3 (8V Facelift), Audi RS3 (8Y) and Audi TT RS (8S).

Browse every brand we supply on our brands page.

Shop by Product Type

Valves: Black Nitride, Inconel and sodium filled Inconel intake and exhaust valves.
Valve Springs and Retainers: dual and beehive spring kits, single springs and seat locators.
Valve Guides: manganese bronze intake and exhaust guides.
Valve Keepers and Locks: 6mm 6 degree and single groove locks.
Valve Stem Seals: Viton exhaust and polyacrylic intake seals.

Each link shows every brand we carry in that category.

Choosing the Right Part

Match parts by engine code and chassis code rather than model year alone. Key identifiers across this range include EJ20 and EJ25 (Subaru WRX, STI, Forester, Liberty and Outback), K20C1 with chassis codes FK8 and FL5 (Honda Civic Type R), 4G63 (Mitsubishi) and DAZA or DNWA (Audi 2.5T FSI).

Valve size: Subaru EJ valves come in standard and oversize head diameters (+0.5mm, +1mm and +1.5mm), and some in a longer 104.2mm or 103.85mm length. Oversize valves need suitable head work and seat machining.
Valve material: Black Nitride adds a hardened, smoother stem surface, Inconel is intended for extreme exhaust temperatures on high-boost builds, and sodium filled Inconel exhaust valves add heat transfer.
Spring kits: EJ kits are listed by seat pressure, from 64 to 100 lb. Choose to suit your camshaft profile and target RPM; the 100 lb kit is labelled for drag racing.
Set quantities: check pack sizes, such as valve stem seals in sets of 10, valve locks in sets of 20 and valve sets of 8, against your cylinder head requirements.

Installation & What You'll Need

Valvetrain work involves cylinder head disassembly and precise measurement, so installation by a professional engine builder is recommended. Typical requirements include a valve spring compressor, guide and seal installation tools, measuring equipment for installed height and spring pressure, and assembly lubricant.

Guides and oversized valves generally require machining of the cylinder head, including guide fitment and valve seat cutting. Always confirm installed heights, retainer-to-seal clearance and coil bind figures with your engine builder before final assembly.

FAQ

Where can I buy Supertech valvetrain parts in Australia?

Chicane Australia carries Supertech valves, springs, guides, locks and seals and ships Australia-wide from the NSW Central Coast. Check the vehicle list above, search by Supertech part number, or contact our team with your engine code and camshaft details.

When should I choose Inconel exhaust valves?

For high-boost or anti-lag equipped engines, Inconel is recommended on the exhaust side, as this nickel-based superalloy stays strong at extreme temperatures where stainless steel can soften or tulip.

What are the benefits of Black Nitride treatment?

Supertech's Black Nitride treatment is a hardening process that penetrates the valve surface rather than sitting on top of it. The result is a harder, smoother stem that reduces guide wear and allows tighter tolerances and improved airflow.

Are Supertech valves one-piece forgings?

Yes. Supertech performance valves are manufactured as one-piece forgings from premium alloys, which gives superior grain flow and mechanical strength compared with two-piece welded valves.

Which Supertech spring kit suits my EJ20 or EJ25?

Pick by seat pressure to match your camshafts and RPM. We list dual spring kits at 64, 70 and 82 lb, beehive kits at 65, 70 and 85 lb, and a 100 lb dual kit for drag racing, plus a 70 lb dual kit for the non-turbo EJ25.

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