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Cylinder Head Intake Valve. Porsche 911 S/TU/T/E - 90110540700
90110540700/1
Vehicle Group
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 914 (1970-1976)
Information
Cylinder Head Intake Valve.
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:
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Related, superseded, cross reference or alternative numbers for comparison.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
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
90110540700
The product you are viewing cross references to these numbers
Price: £30.00
In stock
Related products
Vehicle Group
- 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
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:
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:
Symptoms Of Wear Or Failure:
Why Replacement Matters:
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310540902
The product you are viewing cross references to these numbers
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
Price: £27.00
In stock
Vehicle Group
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) TURBO S 1994-97
Information
Engine Cylinder Head Exhaust Valve.
Diagram Ref No 10
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310541952
The product you are viewing cross references to these numbers
The OE Match Engine Cylinder Head Exhaust Valve is a precision replacement valvetrain component for the Porsche 911 (993) Turbo 3.6L. It controls the release of burnt combustion gases from the cylinder and forms an essential seal against the valve seat when closed.
Fits:- Porsche 993 Turbo 3.6L 1995-98 (M64.60)
Diagram Ref No 10
During the exhaust stroke, the valve opens to allow combustion gases to leave the cylinder and pass into the exhaust system. It then closes firmly against the valve seat, sealing the combustion chamber for the next compression and combustion cycle.
Because exhaust valves operate directly in the path of extremely hot combustion gases, they are subjected to significant heat, pressure and mechanical loading. Correct valve condition, alignment and seating are therefore essential for maintaining cylinder compression, efficient combustion and reliable engine performance.
What This Product Does:
- Controls the release of exhaust gases from the combustion chamber.
- Opens during the exhaust stroke to allow burnt gases to exit the cylinder.
- Closes against the valve seat to maintain combustion-chamber sealing.
- Helps maintain correct cylinder compression.
- Supports efficient combustion and engine performance.
- Helps maintain smooth and consistent power delivery.
- Works with the valve guide, valve seat, valve spring and associated valvetrain components.
- Withstands the high temperatures found on the exhaust side of the cylinder head.
- Replaces a burnt, bent, pitted or excessively worn original valve.
- Helps restore correct cylinder-head operation during an engine rebuild.
For correct operation, the exhaust valve must move smoothly within the valve guide and contact the valve seat evenly around its circumference. Any wear or damage that prevents complete seating can allow compression and hot combustion 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 or throttle response.
- Difficult starting.
- Increased fuel consumption.
- Irregular exhaust note.
- Engine warning light or misfire fault codes.
- Ticking or abnormal valvetrain noise.
- Poor compression-test results.
- Leakage through the exhaust during a cylinder leak-down test.
- Pitting or erosion of the valve face.
- Burnt or damaged valve 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 overall engine efficiency.
Why Replacement Matters:
The exhaust valve operates in one of the most thermally demanding areas of the engine. Every combustion cycle exposes the valve head and seating surface to extremely hot gases while the valve repeatedly opens and closes at high speed.
Over time, an exhaust valve may suffer from:
- Valve-face erosion.
- Burning or pitting.
- Carbon deposits.
- Valve-stem wear.
- Mechanical distortion.
- Overheating.
- Damage caused by poor valve seating.
- Wear associated with excessive valve-guide clearance.
Once the valve can no longer seal correctly, cylinder compression may fall and engine performance can deteriorate.
Replacing a defective exhaust valve helps restore:
- Correct combustion-chamber sealing.
- Cylinder compression.
- Smooth engine operation.
- Consistent power delivery.
- Efficient exhaust-gas control.
- Correct valvetrain operation.
- Long-term cylinder-head reliability.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310541952
99310541952
99310541984
The product you are viewing cross references to these numbers
Price: £55.00
In stock
Vehicle Group
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
Information
Exhaust valve guide 1st oversize.
6 per engine. Price is for each.
Fits:
Porsche 993 Turbo 1994-98
Engine Type M64:60
Material: Bronze
Inner diameter: 8,00 mm
Outer diameter: 13,05 mm
Length: 45,40 mm
Click 'Zoom in' for large parts diagram.
Diagram Ref no 2.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310432161
The product you are viewing cross references to these numbers
6 per engine. Price is for each.
Fits:
Porsche 993 Turbo 1994-98
Engine Type M64:60
Material: Bronze
Inner diameter: 8,00 mm
Outer diameter: 13,05 mm
Length: 45,40 mm
Click 'Zoom in' for large parts diagram.
Diagram Ref no 2.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310432161
99310432161
01-2620
The product you are viewing cross references to these numbers
Price: £12.00
In stock
Vehicle Group
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
Information
Exhaust valve guide 1st oversize.
This is a replacement intake valve guide - the small, cylindrical bushing within the cylinder head that guides the intake valve stem, ensuring correct alignment and smooth, controlled movement as the valve opens and closes. In some rebuild or re-machining scenarios, oversized guides are used to restore proper fit after head work.
Price is for each, 6 required per engine.
Fits:
Porsche 993 1994 - 1998
Diagram Ref no 3.
• Use Cases: Head rebuilds; valve-seat re-cut; restoring compressed guide bores; upgrading worn or damaged valve guides; preventive maintenance where valve guide integrity is uncertain.
• Supplied individually - multiple guides needed per head depending on engine (one per intake valve).
This valve guide keeps the intake valve moving in perfect alignment, ensuring proper sealing, efficient combustion, and stable engine performance. It supports the valve stem to prevent wobble or side movement that can cause uneven seat wear or loss of compression. Designed to withstand high RPM and heat, it promotes smooth valve operation and protects the valve, seat, and cylinder-head surfaces. As an oversize guide, it also restores correct fit in worn or re-machined heads, ensuring a safe and reliable rebuild.
Valve guides endure constant thermal cycles, valve-spring force, and high-speed motion. Over time they can wear, enlarge, or become loose - causing:
• Valve wobble and mis-alignment
• Poor sealing at valve seats - resulting in compression loss, misfires, or exhaust leakage
• Increased valve-stem wear, potential seat damage, or premature engine wear
• Reduced engine efficiency, elevated emissions, and unsafe reliability.
Replacing worn or oversized guides with a proper unit restores correct valve operation, extends cylinder-head life, ensures compression integrity, and brings the engine back to spec - critical for performance, reliability, and longevity.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310432271
The product you are viewing cross references to these numbers
This is a replacement intake valve guide - the small, cylindrical bushing within the cylinder head that guides the intake valve stem, ensuring correct alignment and smooth, controlled movement as the valve opens and closes. In some rebuild or re-machining scenarios, oversized guides are used to restore proper fit after head work.
Price is for each, 6 required per engine.
Fits:
Porsche 993 1994 - 1998
Diagram Ref no 3.
• Use Cases: Head rebuilds; valve-seat re-cut; restoring compressed guide bores; upgrading worn or damaged valve guides; preventive maintenance where valve guide integrity is uncertain.
• Supplied individually - multiple guides needed per head depending on engine (one per intake valve).
This valve guide keeps the intake valve moving in perfect alignment, ensuring proper sealing, efficient combustion, and stable engine performance. It supports the valve stem to prevent wobble or side movement that can cause uneven seat wear or loss of compression. Designed to withstand high RPM and heat, it promotes smooth valve operation and protects the valve, seat, and cylinder-head surfaces. As an oversize guide, it also restores correct fit in worn or re-machined heads, ensuring a safe and reliable rebuild.
Valve guides endure constant thermal cycles, valve-spring force, and high-speed motion. Over time they can wear, enlarge, or become loose - causing:
• Valve wobble and mis-alignment
• Poor sealing at valve seats - resulting in compression loss, misfires, or exhaust leakage
• Increased valve-stem wear, potential seat damage, or premature engine wear
• Reduced engine efficiency, elevated emissions, and unsafe reliability.
Replacing worn or oversized guides with a proper unit restores correct valve operation, extends cylinder-head life, ensures compression integrity, and brings the engine back to spec - critical for performance, reliability, and longevity.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310432271
99310432271
The product you are viewing cross references to these numbers
Price: £15.00
In stock