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Porsche > 993 (911) (1994-1998) > 993 (911) C4 1994-97 > Engine Rebuild Parts > Engine Valves / Guides / Springs >

Exhaust valve guide 41.91mm Porsche 996/997 GT3/Turbo  ❭  99610414503

Exhaust valve guide 41.91mm Porsche 996/997 GT3/Turbo - 99610411560, 99610414501, 99610414501, 99610414503, 99610411560INT
4
Check vehicle fitment
99610414503/3
Product Information
Product Information

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
99610411560
99610414501
99610414501
99610414503
99610411560INT

The product you are viewing cross references to these numbers
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Valve spring. Porsche 993 1995-97 - 99310590151
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Valve spring. Porsche 993 1995-97
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Valve spring

porsche

Fits:
Porsche 993 C2 / C4 3.6L 1994-97

Click 'Zoom in' for large parts diagram.
Diagram Ref No 13.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99310590151
99310590151

The product you are viewing cross references to these numbers
Engine cylinder head exhaust valve. Porsche 993 C2 / C4 1994-95 - 99310541901, 3311.239 - 864430-6
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Engine cylinder head exhaust valve. Porsche 993 C2 / C4 1994-95
99310541901/1
Product Information
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Engine cylinder head exhaust valve. Pre varioram engine cars
The OE Match exhaust valve is a precision engine component designed for Porsche 911 (993) Carrera models equipped with early 3.6L engines. It is installed in the cylinder head and forms part of the valve train responsible for controlling the flow of exhaust gases from the combustion chamber to the exhaust system.
Sold individually, 6 required per vehicle

Fits:
Porsche 993 C2 / C4 3.6L 1993 - 1995
 * with Engine codes:  M64.05 / M64.06 / M64.07 / M64.08

Diagram Ref No 10

The OE Match version of part number 99310541901 is designed for pre-Varioram Porsche 993 engines used in early Carrera models. It is engineered with the correct stem diameter, valve head size and material specification to withstand the extreme temperatures and stresses experienced in high-performance air-cooled engines.

The exhaust valve regulates the release of burnt gases from the combustion chamber. When opened at the correct time by the camshaft, it allows exhaust gases to exit the cylinder and enter the exhaust system, preparing the chamber for the next intake cycle.

Maintaining properly functioning valves is essential for efficient combustion, engine power and reliable operation.

Exhaust valves operate under extremely high temperatures and continuous mechanical stress. Over time they may wear, warp or suffer from carbon buildup, which can lead to compression loss, poor engine performance or valve train noise. Replacing worn valves during engine service or rebuild ensures proper combustion sealing and reliable engine operation.

Consider replacing the exhaust valve if you notice:
•  Loss of compression or engine power
•  Excessive valve train noise
•  Burnt or worn valve surfaces
•  During cylinder head rebuild or engine overhaul

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99310541901
99310541901
3311.239

The product you are viewing cross references to these numbers
Engine cylinder head inlet valve. Porsche 993 C2 / 993 C4 / 993 Turbo - 99310540902, 993.105.409.02, 3310.239, 854429-6
3
Engine cylinder head inlet valve. Porsche 993 C2 / 993 C4 / 993 Turbo
99310540902/1
Product Information
Product Information
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 combustion chamber. Manufactured to OE specifications for fit, precision and durability, this inlet valve is essential for maintaining efficient combustion, engine performance and long-term reliability.  

Fits:
  • Porsche 993 (911) C2 1994-97
  • Porsche 993 (911) C4 1994-97
  • Porsche 993 (911) TURBO 1994-96
  • Porsche 993 (911) TURBO S 1994-97 

Diagram Ref No 9 

Constructed from premium-grade materials engineered to withstand continuous operation and high engine temperatures, the inlet valve works in conjunction with the camshaft, valve springs, valve guides and cylinder head assembly to control intake airflow with precise timing. Proper valve operation ensures optimal cylinder filling, efficient combustion and the responsive performance expected from a Porsche engine.  

What This Product Does:
  • Controls 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 a critical 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 and are subjected to thousands of opening and closing cycles every minute. Over time, exposure to heat, combustion deposits and mechanical wear can cause valves to become worn, bent, burnt, carbon-contaminated or develop sealing issues.
  • A damaged inlet valve can restrict airflow into the combustion chamber, reducing combustion efficiency and negatively affecting engine performance. If left unresolved, valve-related problems can lead to compression loss, increased fuel consumption and potential 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.



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99310540902
99310540902
993.105.409.02
3310.239
854429-6

The product you are viewing cross references to these numbers