Audi R8 Race Valves | 5.2L V10 | Pro Valve Racing

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Custom racing intake and exhaust valves for the Audi R8 5.2L V10 twin turbo platform, built to your exact specifications.

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Audi R8 5.2L V10 Twin Turbo Super Alloy Exhaust (SG)

$49.90

Our Super Alloy Series valve is forged from an IN751 alloy then heat treated and stress relieved with a solution style heat treat process for better control though and through. This process produc...

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Audi R8 5.2L V10 Twin Turbo Intake (SG)

$37.60

Our race series valve is forged from an EV-8 alloy then heat treated and stress relieved with a solution style heat treat process for better control though and through. This process produces a bet...

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PRO Intake and exhaust valve tech info

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Material	Stem Diameter	Overall Length	Tip Length	Groove Type	Seat Angle

Head Diameter: The diameter of the valve head, measured across the widest point of the disc that seals against the valve seat. This is the primary sizing spec for matching a valve to your cylinder head's port and seat.

Stem Diameter: The diameter of the valve stem, the shaft that rides in the valve guide. Common sizes are 5/16", 8mm, and 7mm. Stem diameter must match your guides, locks, and seals.

Overall Length (OAL):The total length of the valve from the tip to the edge of the head. OAL determines spring installed height and rocker arm geometry, so it needs to match your cam and valvetrain setup.

Tip Length:The length of the machined tip surface at the top of the stem, where the rocker arm or lifter makes contact. Tip length affects wear patterns and geometry under valve lift.

Groove Type:The style of lock groove machined into the valve stem, which determines which valve locks (keepers) will fit. Single-groove and multi-groove designs are not interchangeable.

Seat Angle:The angle of the valve face that contacts the seat, typically 30° or 45°. Seat angle must match your cylinder head's seat cut for a proper seal.