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Porsche // 928 (1978-1995) // 928GT 5.0L 1989-91
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Exhaust valve guide 1st oversize. Porsche 993 1994-98 - 99310432172
99310432172/1
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
Information
Exhaust valve guide 1st oversize.
OE Match Exhaust Valve Guide is a precision-engineered valve guide designed to replace the original exhaust valve guide in the Porsche 911 (993) engine. This is a 1st oversize guide - meaning it is slightly larger than standard to accommodate engines that have been reamed or experienced wear over time.
Price is for each, 6 required per engine.
Fits:
Porsche 993 1994 - 1998
Diagram Ref no 2.
This exhaust valve guide keeps the exhaust valve stem perfectly aligned in the cylinder head, helping to ensure the valve seals correctly against the seat, maintains good compression, and promotes efficient evacuation of exhaust gases. A proper valve guide also helps conduct heat away from the valve stem into the head where it can be cooled by the engine’s coolant system.
Function:
• Valve Alignment: Ensures the exhaust valve travels straight and seats accurately each cycle.
• Wear Control: Reduces valve stem wobble and limits side loading that can damage seats or stems.
• Heat Conduction: Helps transfer combustion heat away from the valve stem and into the head casting.
• Rebuild Support: Oversize version is ideal for heads that have been reamed during rebuilds to restore correct fitment.
Fitment
• Installed in the exhaust sides of the cylinder head valve train
• Typically 6 guides per engine are needed for a full head rebuild.
• This part matches Porsche’s oversize guide specification and is used when the standard guide bores have been worked to remove wear or damage.
Valve guides wear over time due to heat, friction, and repeated valve movement. When guides become worn or oversized gaps develop between the valve stem and guide bore, the following issues can arise:
• Loss of performance and power
• Higher oil consumption
• Reduced sealing and compression
• Increased valve train wear
Installing a correct OE Match valve guide restores correct valve alignment, reduces unwanted movement, supports proper seat sealing, and prolongs the life of your engine’s top end - especially in rebuild or high-mileage applications.
Replace valve guides if you observe:
• Blue smoke from the exhaust (signifying oil burning)
• Rough idle or hesitation
• Poor compression or loss of engine power
• Valve stem play when checked during teardown
• During a cylinder head rebuild or valve job
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310432172
The product you are viewing cross references to these numbers
OE Match Exhaust Valve Guide is a precision-engineered valve guide designed to replace the original exhaust valve guide in the Porsche 911 (993) engine. This is a 1st oversize guide - meaning it is slightly larger than standard to accommodate engines that have been reamed or experienced wear over time.
Price is for each, 6 required per engine.
Fits:
Porsche 993 1994 - 1998
Diagram Ref no 2.
This exhaust valve guide keeps the exhaust valve stem perfectly aligned in the cylinder head, helping to ensure the valve seals correctly against the seat, maintains good compression, and promotes efficient evacuation of exhaust gases. A proper valve guide also helps conduct heat away from the valve stem into the head where it can be cooled by the engine’s coolant system.
Function:
• Valve Alignment: Ensures the exhaust valve travels straight and seats accurately each cycle.
• Wear Control: Reduces valve stem wobble and limits side loading that can damage seats or stems.
• Heat Conduction: Helps transfer combustion heat away from the valve stem and into the head casting.
• Rebuild Support: Oversize version is ideal for heads that have been reamed during rebuilds to restore correct fitment.
Fitment
• Installed in the exhaust sides of the cylinder head valve train
• Typically 6 guides per engine are needed for a full head rebuild.
• This part matches Porsche’s oversize guide specification and is used when the standard guide bores have been worked to remove wear or damage.
Valve guides wear over time due to heat, friction, and repeated valve movement. When guides become worn or oversized gaps develop between the valve stem and guide bore, the following issues can arise:
• Loss of performance and power
• Higher oil consumption
• Reduced sealing and compression
• Increased valve train wear
Installing a correct OE Match valve guide restores correct valve alignment, reduces unwanted movement, supports proper seat sealing, and prolongs the life of your engine’s top end - especially in rebuild or high-mileage applications.
Replace valve guides if you observe:
• Blue smoke from the exhaust (signifying oil burning)
• Rough idle or hesitation
• Poor compression or loss of engine power
• Valve stem play when checked during teardown
• During a cylinder head rebuild or valve job
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310432172
9931043217
99310432170
99310432171
99310432172
The product you are viewing cross references to these numbers
Price: £16.00
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
Related, superseded, cross reference or alternative numbers for comparison.
94410432851
94410432851
The product you are viewing cross references to these numbers
Price: £28.04
Orderable
Vehicle Group
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Information
Engine cylinder head inlet valve.
Fits:
Porsche 944 S / 944 S2 3.0L
Porsche 928 S4 / 928 GT / 928 GTS 4&8 cyl.
Click 'Zoom in' for large parts diagram.
Diagram ref no 8.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92810564105
The product you are viewing cross references to these numbers
Fits:
Porsche 944 S / 944 S2 3.0L
Porsche 928 S4 / 928 GT / 928 GTS 4&8 cyl.
Click 'Zoom in' for large parts diagram.
Diagram ref no 8.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92810564105
92810564105
30124
928.105.641.05
30124
854425-4
The product you are viewing cross references to these numbers
Price: £29.00
In stock
Vehicle Group
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
- Porsche 968 Turbo S 3.0L 1993-94
- Porsche 928S2 4.7L 1984-86
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Information
Exhaust valve. Price is for each.
Valve head diameter: 33 mm
Valve stem diameter: 7 mm
Length: 113,6 mm
Fits:
Porsche 944S 1987-88
Porsche 944S2 1989-91
Porsche 928 S4 / GT / GTS 1984-95
Porsche 968 1992-95
Click 'Zoom in' for large parts diagram.
Diagram Ref No 10.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92810564206
The product you are viewing cross references to these numbers
Valve head diameter: 33 mm
Valve stem diameter: 7 mm
Length: 113,6 mm
Fits:
Porsche 944S 1987-88
Porsche 944S2 1989-91
Porsche 928 S4 / GT / GTS 1984-95
Porsche 968 1992-95
Click 'Zoom in' for large parts diagram.
Diagram Ref No 10.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92810564206
92810564206
94410541800
30146
The product you are viewing cross references to these numbers
Price: £34.00
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 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 0.20mm 1st Oversize. Inlet and exhaust.
Fits:
Porsche 924S 1986-88
Porsche 944 1982-89
Porsche 928 1978-96
Outer diameter [mm] 13,26 mm
Bore Ø [mm] 9,00 mm
Length [mm] 40,50 mm
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
Outer diameter [mm] 13,26 mm
Bore Ø [mm] 9,00 mm
Length [mm] 40,50 mm
Click 'Zoom in' for large parts diagram.
Diagram Ref No 6.
Related reference numbers
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94410432851
94410432851
81-30109
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Price: £9.00
In stock