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- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 914 (1970-1976)
This is the standard valve guide used in early air-cooled Porsche 911/930 cylinder heads. It’s a plain (non-hydraulic) guide that locates the valve stem in the head; when worn it causes oil burning, loss of compression and poor valve seating - so they’re commonly replaced whenever heads are rebuilt.
Fits:
Porsche 911 1965-1968 2.0L / 912 SWB (F)
Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
Porsche 911 1978-1983 3.0L / SC
Porsche 911 1984-1986 3.2L
Porsche 911 1987-1989 3.2L G50
Porsche 911 1975-1977 3.0L Turbo (930)
Porsche 911 1978-1989 3.3L Turbo (930)
Diagram Ref No 2 and 2A.
What the part is (technical data / dimensions)
Application: Porsche 911 / 930 from about 1965–1989 (varies slightly by model and year; early cars both intake & exhaust, later years sometimes exhaust only). Standard size (typical OE): ID ≈ 9.00 mm, OD ≈ 13.06 mm, length ≈ 51.2 mm.
Why these guides should be replaced.
Valve guides are a wearing item. Replace them when any of the following occur or when you rebuild the engine head.
Excessive valve stem play — worn guide ID internal diameter lets the valve rock and misalign with the seat , poor sealing, reduced compression and power.
Oil consumption / smoking — worn guides allow oil to wick down the stem into the combustion chamber, causing blue/grey smoke and fouled plugs.
Hard starting, rough idle, misfire — poor sealing / valve timing irregularities from misaligned valves.
Valve wobble that leads to premature valve stem wear or valve seat damage — once stems or seats are damaged you need deeper surgery.
If a guide is cracked, broken, or has excessive ovality — must be replaced.
Whenever you remove and refinish seats / replace springs / do a full head rebuild — replacing guides at that time is cheap insurance and ensures correct alignment.
Inner diameter 9,00 mm
Outer diameter 13,06 mm
Total Length 51,20 mm
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93010432100
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) TURBO S 1994-97
The OE Match Engine Cylinder Head Inlet Valve is a high-quality replacement valvetrain component designed to regulate the flow of air and fuel into the combustion chamber. Manufactured to OE specifications for fit, precision and durability, this inlet valve is essential for maintaining efficient combustion, engine performance and long-term reliability.
Fits:
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) TURBO S 1994-97
Diagram Ref No 9
Constructed from premium-grade materials engineered to withstand continuous operation and high engine temperatures, the inlet valve works in conjunction with the camshaft, valve springs, valve guides and cylinder head assembly to control intake airflow with precise timing. Proper valve operation ensures optimal cylinder filling, efficient combustion and the responsive performance expected from a Porsche engine.
What This Product Does:
- Controls the intake of air and fuel into the combustion chamber.
- Opens and closes in precise synchronisation with the engine cycle.
- Maintains an effective seal during compression and combustion.
- Supports efficient airflow and cylinder filling.
- Helps maximise engine power and throttle response.
- Contributes to fuel economy and emissions control.
- Forms a critical part of the engine valvetrain system.
Symptoms Of Wear Or Failure:
- Reduced engine power and acceleration.
- Rough idle or uneven engine operation.
- Engine misfires.
- Poor throttle response.
- Increased fuel consumption.
- Low compression in the affected cylinder.
- Difficulty starting the engine.
- Ticking or tapping noises from the cylinder head.
- Engine management warning lights or fault codes.
- Failed compression or leak-down test results.
Why Replacement Matters:
- Inlet valves operate continuously under demanding conditions and are subjected to thousands of opening and closing cycles every minute. Over time, exposure to heat, combustion deposits and mechanical wear can cause valves to become worn, bent, burnt, carbon-contaminated or develop sealing issues.
- A damaged inlet valve can restrict airflow into the combustion chamber, reducing combustion efficiency and negatively affecting engine performance. If left unresolved, valve-related problems can lead to compression loss, increased fuel consumption and potential damage to valve seats, cylinder heads and other internal engine components.
- Replacing a worn or damaged inlet valve restores proper airflow, improves combustion efficiency and helps maintain optimal engine performance. An OE Match replacement provides factory-style fitment, precision manufacturing and long-term durability, ensuring reliable operation and helping protect your Porsche engine from premature wear and costly repairs.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310540902
The product you are viewing cross references to these numbers
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) TURBO S 1994-97
The OE Match Engine Cylinder Head Exhaust Valve is a precision replacement valvetrain component for the Porsche 911 (993) Turbo 3.6L. It controls the release of burnt combustion gases from the cylinder and forms an essential seal against the valve seat when closed.
Fits:- Porsche 993 Turbo 3.6L 1995-98 (M64.60)
Diagram Ref No 10
During the exhaust stroke, the valve opens to allow combustion gases to leave the cylinder and pass into the exhaust system. It then closes firmly against the valve seat, sealing the combustion chamber for the next compression and combustion cycle.
Because exhaust valves operate directly in the path of extremely hot combustion gases, they are subjected to significant heat, pressure and mechanical loading. Correct valve condition, alignment and seating are therefore essential for maintaining cylinder compression, efficient combustion and reliable engine performance.
What This Product Does:
- Controls the release of exhaust gases from the combustion chamber.
- Opens during the exhaust stroke to allow burnt gases to exit the cylinder.
- Closes against the valve seat to maintain combustion-chamber sealing.
- Helps maintain correct cylinder compression.
- Supports efficient combustion and engine performance.
- Helps maintain smooth and consistent power delivery.
- Works with the valve guide, valve seat, valve spring and associated valvetrain components.
- Withstands the high temperatures found on the exhaust side of the cylinder head.
- Replaces a burnt, bent, pitted or excessively worn original valve.
- Helps restore correct cylinder-head operation during an engine rebuild.
For correct operation, the exhaust valve must move smoothly within the valve guide and contact the valve seat evenly around its circumference. Any wear or damage that prevents complete seating can allow compression and hot combustion gases to escape.
Symptoms Of Wear Or Failure:
Possible symptoms include:
- Low or uneven cylinder compression.
- Engine misfires.
- Rough or unstable idle.
- Loss of engine power.
- Poor acceleration or throttle response.
- Difficult starting.
- Increased fuel consumption.
- Irregular exhaust note.
- Engine warning light or misfire fault codes.
- Ticking or abnormal valvetrain noise.
- Poor compression-test results.
- Leakage through the exhaust during a cylinder leak-down test.
- Pitting or erosion of the valve face.
- Burnt or damaged valve seating surface.
- Bent or damaged valve stem.
- Excessive valve-stem wear.
- Heavy carbon deposits.
- Failure of the valve to seal correctly against its seat.
A leaking exhaust valve allows combustion pressure to escape into the exhaust port rather than remaining within the cylinder, reducing compression and overall engine efficiency.
Why Replacement Matters:
The exhaust valve operates in one of the most thermally demanding areas of the engine. Every combustion cycle exposes the valve head and seating surface to extremely hot gases while the valve repeatedly opens and closes at high speed.
Over time, an exhaust valve may suffer from:
- Valve-face erosion.
- Burning or pitting.
- Carbon deposits.
- Valve-stem wear.
- Mechanical distortion.
- Overheating.
- Damage caused by poor valve seating.
- Wear associated with excessive valve-guide clearance.
Once the valve can no longer seal correctly, cylinder compression may fall and engine performance can deteriorate.
Replacing a defective exhaust valve helps restore:
- Correct combustion-chamber sealing.
- Cylinder compression.
- Smooth engine operation.
- Consistent power delivery.
- Efficient exhaust-gas control.
- Correct valvetrain operation.
- Long-term cylinder-head reliability.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310541952
The product you are viewing cross references to these numbers
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
6 per engine. Price is for each.
Fits:
Porsche 993 Turbo 1994-98
Engine Type M64:60
Material: Bronze
Inner diameter: 8,00 mm
Outer diameter: 13,05 mm
Length: 45,40 mm
Click 'Zoom in' for large parts diagram.
Diagram Ref no 2.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310432161
The product you are viewing cross references to these numbers