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Porsche // Boxster 986/987/981 (1997-2016) // Boxster 986 2.7L 2003-04
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Cylinder head exhaust valve kit, SET OF 6. Porsche 911 Carrera 3.0 / SC / 3.2 Carrera 1976–89 - 93010541951
93010541951/1KIT
Vehicle Group
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
Information
OE Match cylinder head exhaust valve kit, supplied as six exhaust valves, each with a diameter of 41.5mm.
Fits
- Porsche Carrera 3.0ltr - 1976 to 1977
- Porsche 911 SC 3.0ltr - 1978 to 1983
- Porsche 911 3.2 Carrera 1984 to 1989, comprising 1984–1986 3.2L and 1987–1989 3.2L G50 applications.
Check fitment for your specific vehicle (model, year, engine) before ordering.
Diagram ref no: 10
What This Product Does
Exhaust valves open to let combustion gases leave the cylinders, then close against their seats to seal the combustion chambers. This kit provides the six exhaust valves for the listed applications; it is not a complete cylinder head assembly.
Functions
- Controls the passage of spent gases into the exhaust system.
- Seals each combustion chamber when the exhaust valve is closed.
- Provides replacement exhaust valves for cylinder head refurbishment.
Technical Details
- Contents: six exhaust valves.
- Valve diameter: 41.5mm.
- Component reference: 93010541951.
- SC application recorded in the 1978–83 cylinder head diagram.
- 1984–86 engine references: 930.20/21/26.
- 1987–89 engine references: 930.20/25/26.
Symptoms of Fault
- Reduced or inconsistent cylinder compression.
- Leak-down testing indicating leakage past an exhaust valve.
- Persistent misfiring after ignition and fuelling checks.
- Uneven idling associated with poor valve sealing.
These symptoms require diagnosis rather than confirming valve failure on their own. Oil consumption or smoke can also involve worn guides or seals, which should be assessed separately.
Why Replacement Matters
Worn, burnt or damaged valves may no longer seal correctly. Renewing affected valves during cylinder head work addresses the valve itself, while inspection of the seats, guides and springs helps establish the full repair required. Replacing valves alone does not correct wear elsewhere in the assembly.
FAQs
Does the kit contain guides, springs or seals?
The confirmed contents are six exhaust valves. Do not assume additional cylinder head components are included.
Which checks help identify valve leakage?
Compression testing and a leak-down test help assess cylinder sealing before dismantling. Inspection and measurement then determine which components need attention.
Can this be used for a top-end repair?
It can form part of cylinder head refurbishment on the listed applications. The extent of the work depends on the fault and measured wear.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93010541951
93010541908
93010541915
93010541951
The product you are viewing cross references to these numbers
About kit
This kit is comprised of the following items:
6 x Engine cylinder head exhaust valve. Porsche 911 1978-89 (93010541951/1)
Unit Price: £38.00
InStock
Price: £228.00
In stock
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Information
Oil stem seal. 24 per engine. Price is for each.
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Click 'Zoom in' for large parts diagram.
Diagram ref no 10
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Click 'Zoom in' for large parts diagram.
Diagram ref no 10
Related reference numbers
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95510567500
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Price: £30.69
In stock
Vehicle Group
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
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Information
Valve Spring.
Fits:
Porsche 986 Boxster 2.7L , 3.2L
Click picture for large parts diagram.
Diagram Ref No 12.
Fits:
Porsche 986 Boxster 2.7L , 3.2L
Click picture for large parts diagram.
Diagram Ref No 12.
Price: £45.20
Orderable
Vehicle Group
- 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
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 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:
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:
Symptoms Of Wear Or Failure:
Why Replacement Matters:
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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
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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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Information
Exhaust & Intake Valve Collet.
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Price is for each.
Click picture for large parts diagram.
Diagram Ref No 14.
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