GSC Power Division 2167-8 Super Alloy +1mm Exhaust Valves for 18-23 Mustang 5.0L

Vehicle Fitment

• 2018-2023 Ford Mustang GT (All Trims, 5.0L V8 Coyote Gen 3)
• 2024-2026 Ford Mustang GT (All Trims, 5.0L V8 Coyote Gen 4)
• 2018-2020 Ford F-150 (All Trims, 5.0L V8 Coyote Gen 3)

Fitment Notes

• Does not fit Gen 1 (2011-2014) or Gen 2 (2015-2017) Mustang or F-150 Coyote engines - head and stem dimensions are not compatible.
• A valve job is required before installation due to the 45° valve seat contact angle, which differs from the OEM 40° design.
• Reusing existing valve locks or keepers is not recommended in performance applications due to potential material grooving.

Features

• Super Alloy construction engineered for extreme heat resistance, making it particularly well-suited for high-boost and high-temperature exhaust applications.
• +1mm oversized 33mm head diameter delivers improved exhaust gas flow over the OEM 32mm standard valve.
• Back-cut valve head design reduces restriction and supports sustained high-RPM operation.
• Micro-polished valve stem minimizes oil retention and reduces friction within the valve guide.
• Stellite-fused or hardened valve tip provides extended durability against rocker arm or tappet contact.
• Balanced keeper groove designed to equalize intake and exhaust spring pressures, reducing the need for valve spring shims.
• Compatible with OEM keeper/lock systems for straightforward fitment during assembly.
• Validated using advanced 3D FEA and flow simulation software for real-world performance accuracy.

Specifications

• Position: Exhaust
• Head Diameter: 33mm / 1.299 in (+1mm over standard)
• Total Length: 109.60mm / 4.315 in
• Stem Diameter: 5.96mm / 0.235 in
• Valve Seat Contact Angle: 45° (OEM is 40° - valve job required)
• Material: Super Alloy
• Application: Ford 5.0L Coyote Gen 3 (Mustang & F-150) and Gen 4 (Mustang)

Included Components

• 8x GSC Power Division Super Alloy +1mm Exhaust Valves (33mm head)

Product Description

The GSC Power Division 2167-8 is a set of eight Super Alloy +1mm oversized exhaust valves built for the Ford 5.0L Coyote Gen 3 and Gen 4 engines. The Super Alloy material sets this valve apart from the chrome polished variant - it is specifically formulated to withstand the intense heat and thermal cycling on the exhaust side of the combustion chamber, making it the preferred choice for boosted, high-output, or sustained high-RPM builds. At 33mm, the head is 1mm larger than OEM, improving exhaust scavenging and reducing back pressure at the port.

Construction highlights include a micro-polished stem for reduced guide friction, a stellite-tipped valve tip for long-term wear resistance, and a back-cut head profile engineered to maximize flow velocity. The keeper groove is balanced to work in harmony with GSC's spring and retainer kits, keeping shim requirements to a minimum during assembly. Because these valves use a 45° valve seat contact angle rather than the OEM 40°, seat re-cutting is a required step before installation - standard practice in any serious performance head build.

The 2167-8 is ideal for Mustang GT and F-150 5.0L V8 owners executing a full engine build with aggressive power targets. It pairs directly with GSC's Gen 3/4 valve spring kits, valve guides, and Viton stem seals for a complete valvetrain upgrade.