Inlet / exhaust valve guide 1st Oversize. Porsche 911 1965-89  ❭  93010432150

Valve guide 1st oversize - Inlet and exhaust
The TRW 1st oversize valve guide (93010432150) is an OEM-quality engine component designed for classic Porsche 911 models from 1965 to 1989. Suitable for both inlet and exhaust valve applications, this oversize valve guide is commonly used during engine rebuilding or cylinder head refurbishment where the original guide bore has worn beyond standard specification.
Sold individually, 12 required per engine.

Fits:
Porsche 911 1965 - 1989

Outer diameter: 13,26 mm,
Bore Ø: 9,00 mm,
Length: 51,20 mm,
Fitting Position: Intake Side

Diagram Ref No 2.

Valve guides play a critical role in engine operation by supporting and accurately guiding the movement of the valves within the cylinder head. Proper valve guide clearance is essential for maintaining valve alignment, controlling oil consumption, ensuring effective sealing, and supporting reliable engine performance. Worn valve guides can lead to excessive oil consumption, smoke from the exhaust, valve instability, and reduced engine efficiency.

Manufactured by TRW, a respected OEM supplier of precision engine components, this 1st oversize guide is engineered for rebuild applications where the cylinder head has been machined to accept a larger guide diameter. Produced from durable, heat-resistant materials, it is designed to withstand the demanding temperatures and operating conditions of air-cooled Porsche flat-six engines while maintaining long service life and precise valve control.

Ideal for engine restorations, performance rebuilds, or preventative maintenance, this valve guide helps restore correct valve train geometry and reliable cylinder head operation.

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93010432150

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