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- 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Related, superseded, cross reference or alternative numbers for comparison.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 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 914 (1970-1976)
Maintain the performance and reliability of your classic Porsche engine with this OE Match cylinder head intake valve. Designed to precisely replicate the original Porsche specification, this valve ensures proper airflow, sealing, and combustion efficiency in early air-cooled engines.
Fits:
Porsche 911 S/TU/T/E 1965 - 1969
Porsche 914-6 1970 - 1976
Diagram ref no 9.
Manufactured from high-grade, heat-resistant steel alloy, it delivers outstanding strength, thermal stability, and wear resistance — essential for the demanding environment of Porsche’s horizontally-opposed engines. Each valve is precision-ground for perfect seat contact, ensuring smooth intake flow, consistent compression, and long-term durability.
Function:
The intake valve allows the precise entry of the air-fuel mixture into the combustion chamber. Properly sealing valves are critical for maintaining compression, fuel efficiency, and smooth idle. A high-quality OE Match valve ensures exact timing, optimal airflow, and factory-level performance across the rev range.
Why & When Replacement Matters
Why:
Continuous exposure to heat, carbon build up, and mechanical stress can cause valve face wear, pitting, or bending, leading to loss of compression, rough running, and reduced power.
When:
- During engine rebuilds or top-end overhauls
- When compression loss or poor idle is detected
- If valves show visible wear, burn marks, or stem play
- As part of routine maintenance for high-mileage or performance engines
Replacing with an OE Match intake valve restores engine efficiency, reliability, and preserves the authentic performance character of your classic Porsche.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90110540700
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 914 (1970-1976)
The exhaust valve opens and closes in time with the camshaft to release burnt gases after combustion. A correctly sealing valve helps maintain compression, stable idle, clean running, and consistent performance.
Sold each, 6 required per vehicle.
Fits:
Porsche 911 S/TU/T/E 1965 - 1969
Porsche 914-6 1970 - 1976
Diagram ref no 10
This valve forms a gas-tight seal against the valve seat to contain combustion pressure, then opens to allow exhaust flow out of the cylinder. Because exhaust valves operate under high heat, correct material quality and precise machining are critical for longevity and reliable sealing
A worn, pitted, or burnt exhaust valve can cause compression loss, misfires, poor performance, and potentially lead to costly cylinder head damage if ignored. Replacing valves during a rebuild helps restore correct sealing and reliable operation under heat load.
When to replace:
• Low compression / leak-down points to valve sealing issues
• Burnt valve symptoms (misfire, rough idle, power loss)
• Visible pitting, tuliping, or seat damage during teardown
• Excessive valve stem wear found during head inspection
• During cylinder head overhaul or full engine rebuild
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90110540850
The product you are viewing cross references to these numbers
- Porsche 914 (1970-1976)
The OE Match Engine Cylinder Head Exhaust Valve is a precision replacement valvetrain component for the Porsche 914-4 1.7L air-cooled engine.
Fits:- Porsche 914-4 1.7L
Diagram Ref No 17
Located in the cylinder head, the exhaust valve controls the release of burnt combustion gases from the cylinder. During the exhaust stroke, it opens to allow gases to pass into the exhaust system before closing securely against the valve seat for the next engine cycle.
Because exhaust valves operate directly in the path of extremely hot combustion gases, they experience significant thermal and mechanical stress. Correct valve condition, alignment and seating are essential for maintaining cylinder compression, efficient combustion and reliable engine performance.
What This Product Does:
- Controls the release of burnt gases from the combustion chamber.
- Opens during the exhaust stroke to allow gases to leave the cylinder.
- Closes against the valve seat to seal the combustion chamber.
- Helps maintain correct cylinder compression.
- Supports efficient engine breathing and combustion.
- Helps maintain smooth and consistent engine performance.
- Transfers heat from the valve into the valve seat and cylinder head when closed.
- Works with the valve guide, valve seat, spring and associated valvetrain components.
- Replaces a burnt, bent, pitted or excessively worn exhaust valve.
- Helps restore correct cylinder-head operation during an engine rebuild.
The valve must move freely within its guide and contact the valve seat evenly around its circumference. Wear or damage that prevents complete seating can allow compression and hot gases to escape.
Symptoms Of Wear Or Failure:
Possible symptoms include:
- Low or uneven cylinder compression.
- Engine misfires.
- Rough or unstable idle.
- Loss of engine power.
- Poor acceleration.
- Difficult starting.
- Increased fuel consumption.
- Irregular exhaust note.
- Ticking or tapping noises from the valvetrain.
- Poor compression-test results.
- Leakage through the exhaust during a cylinder leak-down test.
- Burnt or pitted valve face.
- Erosion around the seating surface.
- Bent or damaged valve stem.
- Excessive valve-stem wear.
- Heavy carbon deposits.
- Failure of the valve to seal correctly against its seat.
A leaking exhaust valve allows combustion pressure to escape into the exhaust port rather than remaining within the cylinder, reducing compression and engine efficiency.
Why Replacement Matters:
Exhaust valves operate under some of the highest temperatures found inside an air-cooled engine.
Every combustion cycle exposes the valve head and seating surface to hot gases while the valve repeatedly opens and closes at high speed. Over time, the valve may suffer from:
- Valve-face erosion.
- Burning or pitting.
- Carbon accumulation.
- Valve-stem wear.
- Mechanical distortion.
- Heat-related material deterioration.
- Wear caused by excessive valve-guide clearance.
- Damage caused by poor valve seating.
Once the valve can no longer seal correctly, cylinder compression can fall and engine performance can deteriorate.
Replacing a worn or damaged exhaust valve helps restore:
- Correct combustion-chamber sealing.
- Cylinder compression.
- Smooth engine operation.
- Consistent power delivery.
- Efficient exhaust flow.
- Correct valvetrain operation.
- Reliable cylinder-head performance.
When Replacement Should Be Considered:
Replacement may be necessary when:
- The valve face is burnt or badly eroded.
- The seating surface is heavily pitted.
- The valve stem is bent.
- Valve-stem wear exceeds specification.
- Compression is significantly reduced in the affected cylinder.
- Leak-down testing confirms leakage through the exhaust valve.
- The valve has suffered overheating.
- Excessive valve-guide clearance has damaged the valve.
- Cylinder-head inspection determines that the valve cannot be safely reused.
- A cylinder-head or complete engine rebuild is being carried out.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
022109612D
The product you are viewing cross references to these numbers
- Porsche 914 (1970-1976)
Outlet, 1. Oversize.
Fits:
Porsche 914-2.0
Click 'Zoom in' for large parts diagram.
Diagram ref no 15
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
039101421
The product you are viewing cross references to these numbers