Original Porsche Part Genuine Porsche part 90110540800

Code: 90110540800

Genuine Porsche part

Original Porsche Part

Additional information:

• This part is brand new and unused.
• Please verify that it is 100% suitable for your specific vehicle before purchase to ensure compatibility.

Before purchasing thoroughly check part to confirm compatibility.

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3 3 3

Cylinder Head Intake Valve. Porsche 911 S/TU/T/E

90110540700/1

Product 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:

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Related, superseded, cross reference or alternative numbers for comparison.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

4 4 4 4

Cylinder head exhaust valve. Porsche 911 S/TU/T/E

90110540850/1

Product Information

Cylinder head exhaust valve.
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

90110540850

The product you are viewing cross references to these numbers

Cylinder head exhaust valve kit, SET OF 6. Porsche 911 S / TU / T / E

90110540850/1KIT

Product Information

Cylinder head exhaust valve kit.
OE Match replacement kit designed for the cylinder heads of classic Porsche 911 S, T, T(U), and E engines. This set provides the correct quantity of exhaust valves required for a complete flat-six cylinder head rebuild.
SET OF 6 exhaust valves

Fits:
Porsche 911 S / TU /T / E - 1965 to 1969
Porsche 914-6 - 1970 to 1976

Diagram ref no 10

Exhaust valves control the release of combustion gases from each cylinder. By opening and closing in precise timing with the camshaft, they allow efficient evacuation of exhaust gases while maintaining proper compression when closed. Replacing all exhaust valves as a set ensures balanced engine performance across all cylinders.

Function: Each exhaust valve seals against the valve seat during combustion, then opens to allow exhaust gases to exit the cylinder. Because exhaust valves operate at significantly higher temperatures than intake valves, correct material quality and precise machining are essential for durability, sealing, and long-term reliability.

Exhaust valves are subject to extreme heat and wear. Over time they can burn, pit, or lose their ability to seal correctly, leading to compression loss, misfires, and reduced engine efficiency. Replacing all six exhaust valves during a rebuild ensures consistent combustion, reliable sealing, and protects newly machined valve seats from premature damage.

When to replace
Replace exhaust valves as a complete set when:
•  Performing a full engine or cylinder head rebuild
•  Leak-down or compression tests indicate valve sealing issues
•  Burnt, pitted, or tuliped valves are found during inspection
•   Valve stem wear exceeds specification
•   Restoring or refreshing a classic 911 engine

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

90110540850

90110540850

The product you are viewing cross references to these numbers

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Original Porsche Part Genuine Porsche part 90110540800