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Inlet valve guide 1st oversize, SET OF 6. Porsche 993 1994-98 - 99310432271
99310432271/1KIT
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 set of 6 intake valve guides (1st oversize) is designed for professional cylinder-head rebuilds on Porsche 993 air-cooled flat-six engines. Manufactured to match original Porsche dimensions, material specifications, and hardness ratings, these guides ensure the intake valves operate with correct alignment, stability, and sealing performance - all essential for maintaining proper combustion and long-term engine reliability.
SET OF 6
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.
Oversize valve guides are used when the cylinder-head guide bores have worn or been machined during refurbishment. This set provides a complete, matched group of intake guides, ensuring uniform fitment and valve control across all cylinders. With precision-machined tolerances and excellent heat resistance, these OE-match guides restore the valve train to factory behaviour, eliminating excessive valve play and preventing compression loss, misfires or premature wear.
Perfect for engine rebuilders, restorers, and anyone refreshing a 993 cylinder head, this set supports smooth, accurate valve movement and optimal sealing under the high temperatures and RPM conditions typical of Porsche’s air-cooled performance engines.
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 set of 6 intake valve guides (1st oversize) is designed for professional cylinder-head rebuilds on Porsche 993 air-cooled flat-six engines. Manufactured to match original Porsche dimensions, material specifications, and hardness ratings, these guides ensure the intake valves operate with correct alignment, stability, and sealing performance - all essential for maintaining proper combustion and long-term engine reliability.
SET OF 6
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.
Oversize valve guides are used when the cylinder-head guide bores have worn or been machined during refurbishment. This set provides a complete, matched group of intake guides, ensuring uniform fitment and valve control across all cylinders. With precision-machined tolerances and excellent heat resistance, these OE-match guides restore the valve train to factory behaviour, eliminating excessive valve play and preventing compression loss, misfires or premature wear.
Perfect for engine rebuilders, restorers, and anyone refreshing a 993 cylinder head, this set supports smooth, accurate valve movement and optimal sealing under the high temperatures and RPM conditions typical of Porsche’s air-cooled performance engines.
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
About kit
This kit is comprised of the following items:
6 x Inlet valve guide 1st oversize. Porsche 993 1994-98 (99310432271/1
Price: €104.40
In stock
Related products
Vehicle Group
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Information
Valve guide 1st oversize. Inlet and exhaust.
Fits:
Porsche 924S 1986-88
Porsche 944 1982-89
Porsche 928 1978-96
Click 'Zoom in' for large parts diagram.
Diagram Ref No 6.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94410432851
The product you are viewing cross references to these numbers
Fits:
Porsche 924S 1986-88
Porsche 944 1982-89
Porsche 928 1978-96
Click 'Zoom in' for large parts diagram.
Diagram Ref No 6.
Related reference numbers
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94410432851
94410432851
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Price: €27.86
Orderable
Vehicle Group
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
- Porsche 928S 4.7L 1981-83
Information
Engine cylinder head exhaust valve.
Fits:
Porsche 924S 2.5L V8 1986-88
Porsche 944 2.5L V8
Porsche 928S 4.7L 1980-82
924, 2.5 S M 44.08/M 44.07
924, 2.5 S M 44.08/M 44.07
924, 2.5 S M 44.08/M 44.07
944, 2.5 M 44.08/M 44.02/M 44.07/M 44.04
944, 2.5 M 44.08/M 44.02/M 44.07/M 44.04
944, 2.5 M 44.08/M 44.02/M 44.07/M 44.04
Click 'Zoom in' for large parts diagram.
Diagram Ref No 10.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92810541004
The product you are viewing cross references to these numbers
Fits:
Porsche 924S 2.5L V8 1986-88
Porsche 944 2.5L V8
Porsche 928S 4.7L 1980-82
924, 2.5 S M 44.08/M 44.07
924, 2.5 S M 44.08/M 44.07
924, 2.5 S M 44.08/M 44.07
944, 2.5 M 44.08/M 44.02/M 44.07/M 44.04
944, 2.5 M 44.08/M 44.02/M 44.07/M 44.04
944, 2.5 M 44.08/M 44.02/M 44.07/M 44.04
Click 'Zoom in' for large parts diagram.
Diagram Ref No 10.
Related reference numbers
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92810541004
9281054100
92810541002
92810541004
1869.209
864406-4
The product you are viewing cross references to these numbers
Price: €33.64
In stock
Vehicle Group
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
Information
Engine cylinder head inlet valve.
Fits
Porsche 924S 1986-88 2.5cc
Porsche 944 1982-88 2.5cc
Porsche 928 S, S2 1980-86
924, 2.5 S M 44.03/M 44.01
924, 2.5 S M 44.08/M 44.07
924, 2.5 S M 44.08/M 44.07
924, 2.5 S M 44.08/M 44.07
924, 2.5 S M 44.09/M 44.10
924, 2.5 S M 44.09/M 44.10
924, 2.5 S M 44.09/M 44.10
928, 4.7 S M 28.11/M 28.12
928, 4.7 S M 28.11/M 28.12
928, 4.7 S M 28.11/M 28.12
928, 4.7 S M 28.22/M 28.21
928, 4.7 S M 28.22/M 28.21
928, 4.7 S M 28.22/M 28.21
944, 2.5 M 44.03/M 44.05/M 44.01/M 44.06
944, 2.5 M 44.05/M 44.09/M 44.10
944, 2.5 M 44.05/M 44.09/M 44.10
944, 2.5 M 44.05/M 44.09/M 44.10
944, 2.5 M 44.08/M 44.02/M 44.07/M 44.04
944, 2.5 M 44.08/M 44.02/M 44.07/M 44.04
944, 2.5 M 44.08/M 44.02/M 44.07/M 44.04
Click 'Zoom in' for large parts diagram.
Diagram Ref No 9.
Related reference numbers
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92810540902
The product you are viewing cross references to these numbers
Fits
Porsche 924S 1986-88 2.5cc
Porsche 944 1982-88 2.5cc
Porsche 928 S, S2 1980-86
924, 2.5 S M 44.03/M 44.01
924, 2.5 S M 44.08/M 44.07
924, 2.5 S M 44.08/M 44.07
924, 2.5 S M 44.08/M 44.07
924, 2.5 S M 44.09/M 44.10
924, 2.5 S M 44.09/M 44.10
924, 2.5 S M 44.09/M 44.10
928, 4.7 S M 28.11/M 28.12
928, 4.7 S M 28.11/M 28.12
928, 4.7 S M 28.11/M 28.12
928, 4.7 S M 28.22/M 28.21
928, 4.7 S M 28.22/M 28.21
928, 4.7 S M 28.22/M 28.21
944, 2.5 M 44.03/M 44.05/M 44.01/M 44.06
944, 2.5 M 44.05/M 44.09/M 44.10
944, 2.5 M 44.05/M 44.09/M 44.10
944, 2.5 M 44.05/M 44.09/M 44.10
944, 2.5 M 44.08/M 44.02/M 44.07/M 44.04
944, 2.5 M 44.08/M 44.02/M 44.07/M 44.04
944, 2.5 M 44.08/M 44.02/M 44.07/M 44.04
Click 'Zoom in' for large parts diagram.
Diagram Ref No 9.
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92810540902
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Price: €27.84
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