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- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
Manufactured to OEM specifications, this valve matches the factory dimensions, seat angle, and stem diameter for perfect sealing and valve timing accuracy. Built from high-grade heat-resistant steel, it delivers excellent thermal stability and wear resistance, ideal for the demanding environment of Porsche’s high-revving flat-six engines.
Fits:
Porsche Carrera 3.0ltr - 1976 to 1977
Porsche 911 SC 3.0ltr - 1978 to 1983
Porsche 911 3.2 Carrera - 1983 to 1989
Valve stem diameter 9,00 mm
Length 110,10 mm
Valve seat angle 45 °
Diagram Ref No 9.
Function:
The inlet valve controls the flow of air-fuel mixture into the combustion chamber. Proper sealing and timing are essential for maintaining compression, combustion efficiency, and overall power output. A high-quality OE Match valve ensures consistent intake airflow, reliable operation, and long engine life.
Why & When Replacement Matters
Why: Over time, inlet valves experience wear from heat, carbon build up, and mechanical stress, which can lead to reduced compression, power loss, and rough engine operation.
When: During engine rebuilds or cylinder head servicing If there are signs of valve leakage, pitting, or stem wear. When experiencing loss of power, misfires, or compression imbalance. As preventive maintenance on high-mileage engines or performance builds.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93010540901
The product you are viewing cross references to these numbers
- 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 Engine Cylinder Head Inlet Valve is a precision replacement valvetrain component designed for selected Porsche 996 Turbo, 996 GT2, 997 Turbo, 997 GT2 and GT2 RS 3.6L engines.
Fits:- Porsche 996 Turbo/GT2 2001-05
- Porsche 997.1 Turbo / GT2 3.6L 2007-09
- Porsche 997.2 GT2 RS 3.6L 2011
Diagram Ref No 2
The inlet valve controls the flow of the intake charge into the combustion chamber. During the intake stroke, it opens to allow the cylinder to fill before closing securely against the valve seat for the compression and combustion phases.
Correct valve condition, alignment and seating are essential for maintaining cylinder compression, efficient airflow and consistent engine performance. This is particularly important in high-performance turbocharged engines, where reliable cylinder sealing and airflow are critical under increased boost pressure and engine load.
What This Product Does:
- Controls the intake of air into the combustion chamber.
- Opens during the intake stroke to allow efficient cylinder filling.
- Closes against the valve seat to seal the combustion chamber.
- Helps maintain correct cylinder compression.
- Supports efficient combustion and engine breathing.
- Helps maintain throttle response and engine performance.
- Works with the valve guide, valve seat, valve spring and associated valvetrain components.
- Helps maintain reliable operation in high-performance turbocharged engines.
- Replaces an inlet valve that has become bent, pitted, burnt or excessively worn.
- Helps restore correct cylinder-head operation during engine repair or rebuilding.
For correct operation, the valve must move smoothly within its guide and form an even seal against the valve seat. Wear or damage that prevents complete seating can allow compression to escape and reduce engine efficiency.
Symptoms Of Wear Or Failure:
Possible symptoms include:
- Low or uneven cylinder compression.
- Engine misfires.
- Rough or unstable idle.
- Reduced engine power.
- Poor acceleration or throttle response.
- Difficulty starting.
- Increased fuel consumption.
- Uneven engine running.
- Check engine or engine-management warning light.
- Misfire-related fault codes.
- Ticking or abnormal valvetrain noise.
- Poor compression-test results.
- Leakage through the intake tract during a cylinder leak-down test.
- Pitting or erosion of the valve face.
- Carbon deposits around the valve.
- Bent or damaged valve stem.
- Excessive valve-stem wear.
- Failure of the valve to seal correctly against its seat.
A leaking inlet valve can allow cylinder pressure to escape back into the intake system rather than remaining within the combustion chamber.
Why Replacement Matters:
The inlet valve performs two essential functions: allowing the cylinder to fill efficiently and sealing the combustion chamber when closed.
During engine operation, the valve is exposed to continuous opening and closing cycles, high temperatures, combustion deposits and significant mechanical loading. In turbocharged engines, reliable valve sealing becomes particularly important because the engine operates under substantial cylinder pressures.
Over time, an inlet valve may suffer from:
- Valve-face pitting or erosion.
- Carbon build-up.
- Valve-stem wear.
- Mechanical distortion.
- Damage caused by poor seating.
- Wear associated with excessive valve-guide clearance.
- Damage caused by valve-to-piston contact.
A worn or damaged valve can lead to compression loss, misfires and reduced engine output.
Replacing a defective inlet valve helps restore:
- Correct cylinder sealing.
- Strong compression.
- Efficient intake airflow.
- Smooth engine operation.
- Consistent power delivery.
- Reliable turbocharged engine performance.
- Correct valvetrain operation.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610511172
The product you are viewing cross references to these numbers
- 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 is a precision engine component used in the cylinder heads of Porsche 911 Turbo and GT2 models. It is responsible for controlling the release of exhaust gases from the combustion chamber during the engine’s exhaust cycle.
Sold individually, 12 exhaust valves required per engine (one per cylinder).
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.
The exhaust valve is a key element of the engine valve train system. It sits inside the cylinder head and works with the camshaft, valve springs and lifters to regulate the flow of gases in and out of the engine.
This OE Match version follows the original Porsche design, providing the correct stem diameter, valve head geometry and sealing surface required for proper installation and reliable performance.
During engine operation, the exhaust valve opens to allow burnt gases to exit the combustion chamber and enter the exhaust manifold. It then closes to seal the cylinder during the compression and power strokes.
Properly functioning exhaust valves are essential for maintaining engine compression, combustion efficiency and turbocharger performance.
Function
• Exhaust Gas Control: Releases combustion gases from the cylinder
• Combustion Sealing: Closes to maintain compression during the power cycle
• Engine Performance: Supports efficient airflow and combustion
• Valve Train Operation: Works with camshaft, lifters and valve springs
Exhaust valves operate under extremely high heat and mechanical stress. Over time they can develop wear, carbon buildup, or valve face damage, which may lead to compression loss, reduced engine performance or valve train noise. Replacing worn valves during engine servicing helps maintain proper sealing, stable combustion and reliable turbocharged performance.
Consider replacing the exhaust valve when:
• Performing a cylinder head rebuild
• Engine compression is low or uneven
• Valves show burning, pitting or wear
• During major engine overhaul or restoration
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610511372
The product you are viewing cross references to these numbers
- Porsche 996 TURBO 2000-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche 997 MKII Turbo 2010-13
Exhaust valve guide 41.91mm by OE Match for selected Porsche 996 and 997 GT3 and Turbo engines, supplied as an OE-style replacement for correct valve location in the cylinder head.
What This Product Does
This exhaust valve guide supports and locates the exhaust valve stem in the cylinder head, helping to maintain alignment, minimise side loading, and provide a controlled path for heat transfer away from the valve.
Functions
- Guides the exhaust valve stem within the cylinder head
- Helps maintain valve seating accuracy for consistent sealing
- Provides a running surface for the valve stem to reduce wear
- Contributes to heat transfer from the valve into the cylinder head
Symptoms of Fault
- Blue smoke on overrun or deceleration
- Increased engine oil consumption
- Rough idle or misfires linked to poor valve sealing
- Low compression or high leak-down readings via the exhaust side
- Ticking or tapping noises from the valvetrain area
Why Replacement Matters
Worn or damaged valve guides can affect valve seating, increase oil consumption and contribute to combustion deposits. During top-end or full engine rebuilds, guides are typically renewed along with valves, stem seals and related hardware while the cylinder heads are dismantled, reducing the likelihood of repeat strip-downs after reassembly.
Fits
- Porsche 996 (911) (1997–2005)
- Porsche 996 (911) (1997–2005) ⇒ 996 TURBO 2000–05
- Porsche 996 (911) (1997–2005) ⇒ 996 GT3 MKI 1999–02
- Porsche 996 (911) (1997–2005) ⇒ 996 GT3 MKII 2003–>>
- Porsche 996 (911) (1997–2005) ⇒ 996 GT3 RS 2003–04
- Porsche 997 (911) MK1 2005–2008
- Porsche 997 (911) MK1 2005–2008 ⇒ 997 MK1 TURBO 2007–09
- Porsche 997 (911) MK1 2005–2008 ⇒ 997 MK1 GT3 / GT3 RS 2007–09
- Porsche 997 (911) MK2 2009–2012
- Porsche 997 (911) MK2 2009–2012 ⇒ 997 MKII GT3 / GT3 RS 2010–11
- Porsche 997 (911) MK2 2009–2012 ⇒ 997 MKII Turbo 2010–13
Check fitment for your specific vehicle (model, year, engine) before ordering.
Key Dimensions & Material
Material: copper
Inner diameter: 5.92mm
Outer diameter: 10.54mm
Length: 41.91mm
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610414503
The product you are viewing cross references to these numbers
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche Boxster 981 2.7L 2012-16
- Porsche Boxster 981 S / GTS 3.4L 2012-16
- Porsche Boxster 981 Spyder 3.8L 2016
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
- Porsche Cayman 2.7L 981 2013-16
- Porsche Cayman S / GTS 3.4L 981 2013-16
- Porsche Cayman GT4 3.8L 2015-16
Fits:
Porsche 997.2
Porsche 987.2
Click 'Zoom in' for large parts diagram.
Diagram Ref No 12.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610414555
The product you are viewing cross references to these numbers