Engine Valves / Guides / Springs

Engine cylinder head inlet valve.
Sold each - 12 required per car

Fits:
Porsche 987.1 Boxster 2.7L 2005 - 2008 (Engine code: 9720)
Porsche 987C.1 Cayman 2.7L 2007 - 2008 (Engine code: 9720)

Fitting Position: Intake Side
Valve Head Diameter: 34,50 mm
Valve Stem Diameter: 5,98 mm
Valve seat angle: 45 °
Length: 100,00 mm
Valve Seat Material: Chrome-silicon-steel
Surface: Chromed
Number of grooves: 3

Diagram ref no. 5

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98710511500

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Engine cylinder head inlet valve.
Sold each - 12 required per car

Fits:
Porsche 987.1 Boxster 2.7L 2005 - 2008 (Engine code: 9720)
Porsche 987C.1 Cayman 2.7L 2007 - 2008 (Engine code: 9720)

Fitting Position: Intake Side
Valve Head Diameter: 34,50 mm
Valve Stem Diameter: 5,98 mm
Valve seat angle: 45 °
Length: 100,00 mm
Valve Seat Material: Chrome-silicon-steel
Surface: Chromed
Number of grooves: 3

Diagram ref no. 5

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98710511500

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Engine cylinder head inlet valve. 
Sold each - 12 required per car

Fits:
Porsche 987.2 Boxster 2.9L 2009 - 2012 (Engine code: A120)
Porsche 981 Boxster 2.7L 2012 - 2016 (Engine code: A122)
Porsche 987C.2 Cayman 2.9L 2009 - 2012 (Engine code: A120)
Porsche 981C Cayman 2.7L  2012 - 2016 (Engine code: A122)

Fitting Position: Intake Side
Valve Head Diameter: 34,40 mm
Valve Stem Diameter: 5,98 mm
Valve seat angle: 45 °
Length: 101,60 mm
Valve Seat Material: Chrome-silicon-steel
Surface: Chromed
Number of grooves: 3

Diagram ref no 1

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9A110531402

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Engine cylinder head inlet valve. 
Sold each - 12 required per car

Fits:
Porsche 987.2 Boxster 2.9L 2009 - 2012 (Engine code: A120)
Porsche 981 Boxster 2.7L 2012 - 2016 (Engine code: A122)
Porsche 987C.2 Cayman 2.9L 2009 - 2012 (Engine code: A120)
Porsche 981C Cayman 2.7L  2012 - 2016 (Engine code: A122)

Fitting Position: Intake Side
Valve Head Diameter: 34,40 mm
Valve Stem Diameter: 5,98 mm
Valve seat angle: 45 °
Length: 101,60 mm
Valve Seat Material: Chrome-silicon-steel
Surface: Chromed
Number of grooves: 3

Diagram ref no 1

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9A110531402

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Engine cylinder head inlet valve.
Sold each - 12 required per car

Fits:
Porsche 986 Boxster 2.5L 1997 - 1999 (Engine code: 9620)
Porsche 986 Boxster 2.7L 1999 - 2004 (Engine code: 9622 / 9623)
Porsche 987 Boxster 2.7L 2005 - 2008 (Engine code: 9625)

Diagram Ref No 8.

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99610511105

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Engine Cylinder Head Inlet Valve.
The OE Match Engine Cylinder Head Inlet Valve is a high-quality replacement valvetrain component designed to regulate the flow of air and fuel into the engine's combustion chamber. Manufactured to OE specifications for fit, precision and durability, this inlet valve is essential for maintaining efficient engine breathing, combustion performance and long-term engine reliability.  
Sold Each.
X12 Required Per Car.

Fits:

• Porsche Boxster 986 2.5L 1997-99
• Porsche Boxster 986 2.7L 1999-02
• Porsche Boxster 986 2.7L 2003-04
• Porsche Boxster 987 2.7L 2005-08/08

Diagram Ref No 8  

Produced from premium-grade, heat-resistant materials, the inlet valve is engineered to withstand the constant mechanical loads and high operating temperatures associated with modern engine operation. Working in conjunction with the camshaft, valve springs, valve guides and cylinder head assembly, it ensures precise control of intake airflow, helping the engine deliver optimal power, fuel efficiency and responsiveness.  

What This Product Does:

• Controls the intake of air and fuel into the combustion chamber.
• Opens and closes in precise timing with engine operation.
• Maintains an effective seal during compression and combustion cycles.
• Supports efficient airflow and engine breathing.
• Helps maximise engine performance and throttle response.
• Contributes to fuel efficiency and emissions control.
• Forms a critical part of the engine valvetrain system.

Symptoms Of Wear Or Failure:

• Loss of engine power and performance.
• Rough idle or uneven engine running.
• Engine misfires.
• Poor throttle response and acceleration.
• Increased fuel consumption.
• Low compression in the affected cylinder.
• Difficulty starting the engine.
• Ticking or tapping noises from the cylinder head.
• Engine management warning lights or fault codes.
• Failed compression or leak-down test results.

Why Replacement Matters:

• Inlet valves are subjected to continuous opening and closing cycles while being exposed to heat, combustion by-products and airflow turbulence. Over time, valves can become worn, bent, burnt, carbon-contaminated or develop sealing issues that negatively affect engine efficiency and performance.
• A damaged inlet valve can restrict airflow into the combustion chamber, resulting in poor combustion, reduced power output and increased fuel consumption. If left unresolved, valve-related problems can contribute to compression loss and may cause additional wear to valve seats, cylinder heads and other internal engine components.
• Replacing a worn or damaged inlet valve restores proper airflow, improves combustion efficiency and helps maintain optimal engine performance. An OE Match replacement provides factory-style fitment, precision manufacturing and long-term durability, ensuring reliable operation and helping protect your Porsche engine from premature wear and costly repairs.

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99610511105

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Engine Cylinder Head Inlet Valve.
The OE Match Engine Cylinder Head Inlet Valve is a high-quality replacement valvetrain component designed to control the flow of the air-fuel mixture into the engine's combustion chamber. Manufactured to OE specifications for fit, precision and durability, this inlet valve plays a crucial role in maintaining efficient engine breathing, combustion efficiency and overall engine performance.  

Fits:

• Porsche Boxster S 986 3.2L 1999-02
• Porsche Boxster S 986 3.2L 2003-04
• Porsche 996 C2 3.4L 1997-08/01
• Porsche 996 C4 3.4L 1997-08/01  

Diagram Ref No 8

Constructed from premium-grade, heat-resistant materials, the inlet valve is engineered to withstand constant operation, repeated opening and closing cycles, and the demanding conditions found within the cylinder head. Working alongside the camshaft, valve springs, valve guides and cylinder head assembly, it ensures precise airflow management and reliable combustion throughout the engine's operating range.  

What This Product Does:

• Regulates the intake of air and fuel into the combustion chamber.
• Opens and closes in precise synchronisation with the engine cycle.
• Maintains an effective seal during compression and combustion.
• Supports efficient airflow and cylinder filling.
• Helps maximise engine power and throttle response.
• Contributes to fuel economy and emissions control.
• Forms an essential part of the engine valvetrain system.

Symptoms Of Wear Or Failure:

• Reduced engine power and acceleration.
• Rough idle or uneven engine operation.
• Engine misfires.
• Poor throttle response.
• Increased fuel consumption.
• Low compression in the affected cylinder.
• Difficulty starting the engine.
• Ticking or tapping noises from the cylinder head.
• Engine management warning lights or fault codes.
• Failed compression or leak-down test results.

Why Replacement Matters:

• Inlet valves operate continuously under demanding conditions, experiencing thousands of opening and closing cycles every minute while being exposed to heat, combustion deposits and airflow turbulence. Over time, valves can become worn, bent, burnt, carbon-contaminated or develop sealing issues that reduce engine efficiency and performance.
• A damaged inlet valve can restrict airflow into the combustion chamber, resulting in poor combustion, reduced power output and increased fuel consumption. If left unresolved, valve-related problems can lead to compression loss and may cause additional damage to valve seats, cylinder heads and other internal engine components.
• Replacing a worn or damaged inlet valve restores proper airflow, improves combustion efficiency and helps maintain optimal engine performance. An OE Match replacement provides factory-style fitment, precision manufacturing and long-term durability, ensuring reliable operation and helping protect your Porsche engine from premature wear and costly repairs.

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99610511155

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Exhaust & Intake Valve Collet.

Fits:
Porsche 986 Boxster 1997-04
Porsche 987 Boxster 2005-08
Porsche 987C Cayman 2007-08
Porsche 996 C2/ C4 / C4S 1998-05
Porsche 997 C2 / C2S / C4 / C4S 2005-08

Price is for each.

Click picture for large parts diagram.
Diagram Ref No 14.

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99610512351

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Valve guide - Exhaust. Length 35.36mm



Fits:
Porsche 996 3.4L / 3.6L
Porsche 986 Boxster 2.7L , 3.2L

Material Copper
Inner diameter [mm] 6,00 mm
Outer diameter [mm] 11,05 mm
Length [mm] 35.36mm

Click 'Zoom in' for large parts diagram.
Diagram Ref No 12.

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99610414503

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Valve guide - Exhaust. Length 40.30 mm
OE Match exhaust valve guide 40.30mm for Porsche 996 and Boxster 986 models. This replacement valve guide helps support correct exhaust valve movement, valve seating, and reliable cylinder head operation during engine repair or rebuild.
Sold individually

Fits:
Porsche 996 Carrera 3.4L 1997 - 2001 (Engine code: 9601 / 9602 / 9604)
Porsche 996 Carrera 3.6L 2002 - 2005 (Engine code: 9603)
Porsche 986 Boxster 2.7L 2002 - 2004 (Engine code: 9623)
Porsche 986 Boxster 3.2L 2002 - 2004 (Engine code: 9624)

Material Copper
Inner diameter [mm] 6,00 mm
Outer diameter [mm] 11,05 mm
Length [mm] 40,30 mm

Diagram Ref No 4

The exhaust valve guide keeps the exhaust valve aligned as it opens and closes. A correctly fitted valve guide helps maintain valve seating, oil control, compression, and smooth engine operation.

Functions
•  Replaces the exhaust valve guide
•  Guides and supports the exhaust valve stem
•  Helps maintain correct valve alignment and movement
•  Supports reliable valve seating and sealing
•  Helps reduce valve stem wear and excessive oil consumption
•  Suitable for cylinder head overhaul or engine rebuild work
•  OE Match replacement for Porsche 996 and Boxster 986 engine repair.

Why Replace This Part?
Valve guides can wear due to heat, mileage, friction, lubrication issues, and exhaust temperature. A worn exhaust valve guide can cause valve movement, poor sealing, smoke from oil consumption, reduced compression, valve noise, misfires, or poor engine performance. Replacement is recommended during cylinder head repair when guide wear is outside tolerance.

When to Replace This Part
•   Cylinder head rebuild or engine overhaul is being carried out
•   Exhaust valve guide wear is present
•   Valve stem movement is excessive
•   Oil consumption or exhaust smoke is being investigated
•   Compression or valve sealing issues are present
•   Exhaust valves are being replaced
•   The engine is undergoing Porsche 996 or Boxster 986 restoration.

Where it fits on the car
This valve guide fits inside the engine cylinder head and supports the exhaust valve stem. It is used in the exhaust valve side of the valve train.

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99610414503

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Valve guide - Exhaust
The Genuine Porsche 99610414503 exhaust valve guide is an OE cylinder head component for selected Porsche 996 3.4L / 3.6L and 986 Boxster 2.7L / 3.2L engines. It guides the exhaust valve stem, supports correct valve movement and helps restore factory valve train function during cylinder head repair or engine rebuild work.
Sold individually

Fits:
Porsche 996 Carrera 3.4L 1997 - 2001 (Engine code: 9601 / 9602 / 9604)
Porsche 996 Carrera 3.6L 2002 - 2005 (Engine code: 9603)
Porsche 986 Boxster 2.7L 2002 - 2004 (Engine code: 9623)
Porsche 986 Boxster 3.2L 2002 - 2004 (Engine code: 9624)

Diagram Ref No 4

This part is used during cylinder head repair, valve train service or engine rebuild work on selected Porsche flat-six engines.

What This Part Does / Functions
•  Guides the exhaust valve stem within the cylinder head
•  Helps maintain correct exhaust valve alignment
•  Supports smooth valve opening and closing
•  Helps control valve stem movement and wear
•  Works with the valve stem seal to help control oil consumption
•  Supports correct valve seating and combustion sealing
•  Replaces a worn, loose, damaged or out-of-specification valve guide
•   Provides correct OE Porsche material, dimensions and fitment.

Why Replace This Part?
Exhaust valve guides are exposed to high exhaust temperatures, valve movement, combustion heat and long-term engine wear. Over time, the guide can wear internally, allowing excess valve stem movement. Worn valve guides may contribute to oil consumption, exhaust smoke, poor valve sealing, valve train noise or reduced engine performance. Replacing the guide with a Genuine Porsche OE exhaust valve guide helps restore correct valve stem support and factory cylinder head specification during engine repair or rebuild work.

Common Symptoms of Worn Valve Guides
•   Excessive oil consumption
•   Blue smoke from the exhaust
•   Worn or loose exhaust valve movement
•   Poor valve sealing or compression issues
•   Valve train noise
•   Carbon build-up around exhaust valves
•   Failed cylinder head inspection
•   Engine rebuild requiring valve guide renewal.

When to Replace This Part
•   During cylinder head overhaul
•   During engine rebuild or top-end repair
•   If the exhaust valve guide is worn beyond tolerance
•   If valve stem-to-guide clearance is excessive
•   If the guide is cracked, loose or damaged
•   When replacing exhaust valves and related valve train parts
•   If oil consumption or exhaust smoke is traced to worn guides
•   When restoring the engine with Genuine Porsche OE components.

Where It Fits on the Car
This valve guide is fitted inside the engine cylinder head, in the exhaust valve guide bore. It supports the exhaust valve stem and works with the valve, valve spring, valve stem seal and cylinder head seat. Installation requires specialist cylinder head equipment and machining procedures. Valve guide replacement should be carried out by an experienced engine builder or Porsche specialist.

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99610414503

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Exhaust valve spring set.


Fits:
Porsche 987.2 Boxster S 3.4L / Boxster Spyder 2009-12
Porsche 987C.2 Cayman S 3.4L / Cayman R 2009-12
Porsche 997.2 3.6L / S 3.8L 2009-12

Click 'Zoom in' for large parts diagram.
Diagram ref no 9

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9A110511501

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Exhaust Valve. Porsche 996 3.6L / 997 3.6L / 997 3.8L / Boxster 987 3.4L



Fits:
Porsche 996 3.6L 2001>> M96.03
Porsche 997 3.8L M97.01
Porsche 997 3.6L M96.05
Porsche 987 Boxster 3.4L

Click picture for large parts diagram.
Diagram Ref No 9.

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99610527304

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Exhaust valve.



Fits:
Porsche 996 3.6L 2001>> M96.03
Porsche 997 3.8L M97.01
Porsche 997 3.6L M96.05
Porsche 987 Boxster 3.4L

Click 'Zoom in' for large parts diagram.
Diagram ref no 9.

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99610527304

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Exhaust valve. Porsche 996 3.6L / 997 3.6L / 997 3.8L / Boxster 987 3.4L.



Fits:
Porsche 996 3.6L 2001>> M96.03
Porsche 997 3.8L M97.01
Porsche 997 3.6L M96.05
Porsche 987 Boxster 3.4L

Click 'Zoom in' for large parts diagram.
Diagram ref no 9.

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99610527304

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Inlet valve.



Fits:
Porsche 996 3.6L 2001>> M96.03
Porsche 997 3.8L M97.01
Porsche 997 3.6L M96.05
Porsche 987 Boxster 3.4L

Click 'Zoom in' for large parts diagram.
Diagram Ref No 9.

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99610527102

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