Engine Valves / Guides / Springs

Engine cylinder head exhaust valve.



Fits:
Porsche 996 3.4L C2, C4 1997-01
Porsche 986 Boxster 3.2L
Porsche 987 Boxster 3.2L

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Diagram Ref No 9.

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99610524700

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Engine cylinder head exhaust valve.



Fits:
Porsche 996 3.4L C2, C4 1997-01
Porsche 986 Boxster 3.2L
Porsche 987 Boxster 3.2L

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

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99610524700

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Engine cylinder head exhaust valve.



Fits:
Porsche 996 Turbo/GT2 2001-05
Porsche 997.1 Turbo / GT2 3.6L 2007-09
Porsche 997.2 GT2 RS 3.6L 2011

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Diagram Ref No 3.

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99610511372

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Engine cylinder head exhaust valve.
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

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99610511372

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Engine cylinder head inlet valve.



Fits:
Porsche 996 Turbo/GT2 2001-05
Porsche 997.1 Turbo / GT2 3.6L 2007-09
Porsche 997.2 GT2 RS 3.6L 2011

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Diagram Ref No 2.

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99610511172

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Engine cylinder head inlet valve. Porsche 996 Turbo / 997 Turbo



Fits:
Porsche 996 Turbo/GT2 2001-05
Porsche 997.1 Turbo / GT2 3.6L 2007-09
Porsche 997.2 GT2 RS 3.6L 2011

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Diagram Ref No 2.

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99610511172

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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

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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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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

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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. 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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