Inlet / exhaust valve guide 1st Oversize, SET OF 12. Porsche 911 1965-89

SET OF 12 valve guides - 1st Oversize -  Inlet x6 and exhaust x6.

This set of 12 consists of twelve valve guides 93010432150 (first oversize) allowing you to replace the guides in all cylinders of your Porsche engine in one comprehensive package. Ideal for a full cylinder head rebuild, this matched set ensures uniform fitment across all cylinders and simplifies parts procurement.

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.

•  Position on Vehicle: All valve positions across the engine’s cylinder heads where intake/exhaust guides are located.

• Applications: Recommended when undertaking a full head rebuild, especially after seat machining, guide bore wear or when aiming for consistent component age across all cylinders.

Replacing all valve guides together ensures even wear characteristics, consistent valve movement and avoids mixing new guides with old worn ones which may compromise engine balance or longevity.

When to replace full set:
•  Full cylinder head rebuild including seat work, milling or guide bore enlargement.
•  Engine showing symptoms of widespread valve guide wear (smoke, oil consumption, play) across multiple cylinders.
•  When aiming for maximum long-term reliability and standardised new parts across the engine.


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