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Porsche // 964 (911) (1989-1994) // Any
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- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII GT2 RS 2011-13
The OE Match exhaust valve set includes 12 precision-engineered exhaust valves designed for Porsche 996 Turbo, 996 GT2, 997 Turbo and 997 GT2 models. These valves are installed in the cylinder heads and control the release of exhaust gases from the combustion chambers during the engine’s exhaust cycle.
SET OF 12 exhaust valves
Fits:
Porsche 996 Turbo / GT2 2001 - 2005
Porsche 997.1 Turbo / GT2 3.6L 2007 - 2009
Porsche 997.2 GT2 RS 3.6L 2011
Diagram ref no 3.
Exhaust valves are a critical component of the engine valve train. Each valve sits in the cylinder head and is operated by the camshaft through the valve train mechanism. During the combustion cycle, the valve opens to allow burnt gases to exit the cylinder and then closes to seal the chamber for the next intake and compression phases.
The OE Match set contains 12 exhaust valves, which corresponds to the number required for a complete flat-six turbo engine used in Porsche 996 and 997 Turbo models.
These valves are engineered to withstand the high temperatures and pressures generated by turbocharged combustion while maintaining precise sealing and smooth valve train operation.
The exhaust valves open during the exhaust stroke to release burnt gases from the combustion chamber and close to maintain compression during the compression and power strokes. This process ensures efficient combustion and optimal engine performance.
Replacing worn valves during engine servicing or rebuild ensures consistent sealing across all cylinders and reliable engine operation.
Exhaust valves operate under extreme temperatures and constant mechanical stress. Over time they can develop wear, carbon buildup or valve face damage, which may cause compression loss or reduced engine efficiency. Replacing the valves as a full set ensures balanced performance across all cylinders and helps maintain reliable engine operation.
Consider replacing the exhaust valves when:
• Performing a cylinder head rebuild
• Engine compression is low or uneven
• Valves show burning, pitting or excessive wear
• During a major engine overhaul or restoration
Related reference numbers
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99610511372
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
Valve Spring
Sold each
The Porsche Valve Spring is a critical component
of the valve train system fitted to numerous Porsche 911 and Porsche 964 models
from 1965 to 1994. Designed to maintain precise valve operation throughout the
engine's RPM range, the valve spring ensures that intake and exhaust valves
close correctly after being opened by the camshaft.
Fits:
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
Diagram Ref No 13
In Porsche's legendary air-cooled flat-six engines, accurate valve control is essential for maintaining combustion efficiency, engine performance, reliability, and long-term durability. The valve spring works continuously under extreme mechanical stress, cycling thousands of times per minute to keep the valve train operating correctly.
Whether you're rebuilding a classic Porsche engine, restoring a 911, or carrying out a cylinder head overhaul, replacing worn valve springs helps maintain factory performance and reduces the risk of costly engine damage.
What Does the Valve Spring Do?
The valve spring is responsible for returning the intake and exhaust valves to their closed position after each opening cycle generated by the camshaft.
Its key functions include:
- Maintaining correct valve timing operation
- Ensuring valves close fully and consistently
- Keeping the valve train under proper tension
- Preventing valve float at higher engine speeds
- Supporting engine compression and combustion efficiency
- Protecting the valve train from instability and excessive wear
Without adequate spring tension, valves may not close correctly, leading to poor performance and potential engine damage.
Why Does the Valve Spring Fail?
Valve springs are constantly subjected to compression, heat, vibration, and high engine speeds. Over time, these factors can lead to material fatigue and a gradual loss of spring tension.
Common causes of valve spring failure include:
- Metal fatigue from repeated cycling
- High mileage wear
- Prolonged exposure to engine heat
- Over-revving the engine
- Corrosion or contamination
- Performance modifications increasing valve train loads
- Age-related weakening of spring material
- Improper engine assembly or valve train geometry
As spring pressure decreases, valve control becomes less precise, particularly at higher RPM.
Common Symptoms of Worn Valve Springs
A weakened or damaged valve spring may cause:
- Loss of engine performance
- Valve float at higher RPM
- Rough idle
- Engine misfires
- Increased valve train noise
- Reduced power output Inconsistent compression readings
- Premature wear of valves, guides, and camshaft components
In severe cases, a broken valve spring can result in valve-to-piston contact and major engine damage.
When Should You Replace Valve Springs?
Valve springs should be inspected whenever the cylinder heads are removed and replaced if any signs of fatigue or wear are detected.
Replacement is strongly recommended:
- During complete engine rebuilds
- During cylinder head refurbishment
- On high-mileage engines
- When installing performance camshafts
- If valve float is present
- When spring tension falls below specification
- During preventative maintenance on restoration projects
- Whenever a spring shows signs of corrosion or damage
Many experienced Porsche engine builders replace all valve springs during rebuilds to ensure consistent valve train performance and long-term reliability.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90110590151
The product you are viewing cross references to these numbers
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
Fits:
Porsche 964 C2 / C4 1989-94
Click 'Zoom in' for large parts diagram.
Diagram Ref No 2, 2A.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
964104321
The product you are viewing cross references to these numbers
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 964 (911) TURBO 3.3L 1991-93
Fits:
Porsche 930 turbo 3.0ltr - 1975 to 1977
Porsche 930 turbo 3.3ltr - 1978 to 1989
Porsche 964 turbo 3.3ltr - 1991 to 1992
Click 'Zoom in' for large parts diagram.
Diagram Ref No 10.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93010541950
The product you are viewing cross references to these numbers
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
This is a sodium-filled exhaust valve designed to Porsche’s original specifications, as used in 964 Carrera (C2 / C4) 3.6L engines (1990–94). The sodium fill helps dissipate heat from the valve head into the valve stem, improving thermal management under exhaust conditions.
Sold each, 6 required per car.
Fits:
Porsche 964 Carrera 2 / Carrera 4 3.6L 1989 - 1994 (M64.01 / M64.02)
Porsche 964 RS Carrera 3.6L 1991 - 1994 (M96.03)
Diagram Ref No 12.
What exhaust valve does:
• Seals the combustion chamber on the exhaust side, opening and closing at the correct times to allow exhaust gases to exit
• The internal sodium enhances heat transfer, reducing valve temperature, helping prevent distortion or burning
• Works in tandem with valve springs, guides, and seats to maintain consistent cylinder head performance
Over time, exhaust valves undergo extreme heat cycles, which can lead to wear, bending, warping, or pitting on the sealing face. A faulty or damaged exhaust valve can lead to compression loss, misfires, reduced power, excessive smoking, or engine damage. Replacement improves reliability, restores engine efficiency, and ensures long life under high temperature conditions
• It fits in the cylinder head’s exhaust valve seat for Porsche 964 the exhaust port side of each combustion chamber
• The valve stem goes through the valve guide in the head, and the head of the valve seals against the exhaust seat when closed, with its tip actuated by the rocker or cam mechanism.
Related reference numbers
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96410541903
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