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Porsche 911 & 912 (1965-1989) Engine Rebuild Parts Engine Valves / Guides / Springs

Engine cylinder head exhaust valve. Porsche 996 3.4L / Boxster 986 3.2L / Boxster 987 3.2L  ›  99610524700

Engine cylinder head exhaust valve. Porsche 996 3.4L / Boxster 986 3.2L / Boxster 987 3.2L - 99610511359, 99610524700, 996.105.247.00, 3891.239, 864439-6, 22909
2
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99610524700/1
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Product Information
Engine Cylinder Head Exhaust Valve.

The OE Match Engine Cylinder Head Exhaust Valve is a precision replacement valvetrain component designed to control the release of burnt combustion gases from the engine cylinder.

Fits:

  • Porsche Boxster S 986 3.2L 1999-02
  • Porsche Boxster S 986 3.2L 2003-04
  • Porsche Boxster 987 S 3.2/3.4L 2005-08/08
  • Porsche 996 C2 3.4L 1997-08/01
  • Porsche 996 C4 3.4L 1997-08/01  

Diagram Ref No 9

Located within the cylinder head, the exhaust valve opens at the correct point in the engine cycle to allow combustion gases to leave the cylinder and enter the exhaust system. It then closes firmly against the valve seat to seal the combustion chamber during the compression and power strokes.

Because exhaust valves are directly exposed to extremely hot combustion gases, they operate under demanding thermal and mechanical conditions. Correct valve condition and seating are therefore essential for maintaining cylinder compression, efficient combustion and reliable engine performance.

This OE Match replacement provides an OE-style solution for engine repair, cylinder-head refurbishment or complete engine rebuilding.

What This Product Does:

  • Controls the flow of exhaust gases out of the combustion chamber.
  • Opens to allow burnt gases to enter the exhaust system.
  • Closes against the valve seat to seal the cylinder.
  • Helps maintain correct cylinder compression.
  • Supports efficient combustion and engine performance.
  • Works with the camshaft, lifters, valve spring, valve guide and valve seat.
  • Helps maintain consistent engine power and smooth running.
  • Provides the correct sealing surface between the valve and cylinder head.
  • Replaces a burnt, bent, worn or damaged original exhaust valve.

The valve face must form an accurate seal against the valve seat every time the valve closes. Even relatively minor damage to the valve face or stem can affect cylinder sealing and engine performance.

Symptoms Of Wear Or Failure:
A worn, burnt or damaged exhaust valve may cause:

  • Engine misfires.
  • Rough or unstable idle.
  • Loss of engine power.
  • Poor acceleration.
  • Reduced compression in the affected cylinder.
  • High cylinder leak-down readings.
  • Air leakage heard through the exhaust during a leak-down test.
  • Difficulty starting the engine.
  • Increased fuel consumption.
  • Engine management warning light.
  • Misfire-related fault codes.
  • Irregular exhaust note.
  • Ticking or tapping noises from the cylinder head.
  • Burnt, pitted or eroded valve face.
  • Bent or excessively worn valve stem.
  • Excessive carbon deposits.
  • Visible overheating or discolouration of the valve.

A damaged exhaust valve can prevent the cylinder from sealing correctly, allowing compression and hot combustion gases to escape into the exhaust port.

Why Replacement Matters:
Exhaust valves operate in one of the hottest areas of the engine. Every combustion cycle exposes the valve head and seating surface to intense heat while the valve repeatedly opens and closes at high speed.

Over time, an exhaust valve can suffer from:

  • Valve-face erosion.
  • Pitting or burning.
  • Carbon build-up.
  • Stem wear.
  • Mechanical distortion.
  • Overheating.
  • Poor seating caused by valve-guide or valve-seat wear.

Once the valve can no longer seal correctly, compression in the affected cylinder can fall. This can lead to misfires, reduced power, rough running and increased fuel consumption.

Replacing a damaged exhaust valve helps restore:

  • Correct combustion-chamber sealing.
  • Cylinder compression.
  • Smooth engine operation.
  • Reliable exhaust-gas control.
  • Consistent engine performance.
  • Correct valvetrain operation.



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99610524700
99610511359
99610524700
996.105.247.00
3891.239
864439-6
22909

The product you are viewing cross references to these numbers
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Valve spring. Porsche 911 1965-89 / 964 1990-94 - 90110590150, 90110590151
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Valve spring. Porsche 911 1965-89 / 964 1990-94
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Valve Spring
Sold each

The Porsche Valve Spring is a critical component of the valve train system fitted to numerous Porsche 911 and Porsche 964 models from 1965 to 1994. Designed to maintain precise valve operation throughout the engine's RPM range, the valve spring ensures that intake and exhaust valves close correctly after being opened by the camshaft.

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)
  • Porsche 964 (911) C2 1989-93
  • Porsche 964 (911) C4 1989-93
  • Porsche 964 (911) RS 3.6L 1991-93
  • Porsche 964 (911) RS 3.8L 1991-93
  • Porsche 964 (911) TURBO 3.3L 1991-93
  • Porsche 964 (911) TURBO 3.6L 1991-93

Diagram Ref No 13

In Porsche's legendary air-cooled flat-six engines, accurate valve control is essential for maintaining combustion efficiency, engine performance, reliability, and long-term durability. The valve spring works continuously under extreme mechanical stress, cycling thousands of times per minute to keep the valve train operating correctly.

Whether you're rebuilding a classic Porsche engine, restoring a 911, or carrying out a cylinder head overhaul, replacing worn valve springs helps maintain factory performance and reduces the risk of costly engine damage.

What Does the Valve Spring Do?

The valve spring is responsible for returning the intake and exhaust valves to their closed position after each opening cycle generated by the camshaft.

Its key functions include:

  • Maintaining correct valve timing operation
  • Ensuring valves close fully and consistently
  • Keeping the valve train under proper tension
  • Preventing valve float at higher engine speeds
  • Supporting engine compression and combustion efficiency
  • Protecting the valve train from instability and excessive wear

Without adequate spring tension, valves may not close correctly, leading to poor performance and potential engine damage.

Why Does the Valve Spring Fail?

Valve springs are constantly subjected to compression, heat, vibration, and high engine speeds. Over time, these factors can lead to material fatigue and a gradual loss of spring tension.

Common causes of valve spring failure include:

  • Metal fatigue from repeated cycling
  • High mileage wear
  • Prolonged exposure to engine heat
  • Over-revving the engine
  • Corrosion or contamination
  • Performance modifications increasing valve train loads
  • Age-related weakening of spring material
  • Improper engine assembly or valve train geometry

As spring pressure decreases, valve control becomes less precise, particularly at higher RPM.

Common Symptoms of Worn Valve Springs

A weakened or damaged valve spring may cause:

  • Loss of engine performance
  • Valve float at higher RPM
  • Rough idle
  • Engine misfires
  • Increased valve train noise
  • Reduced power output Inconsistent compression readings
  • Premature wear of valves, guides, and camshaft components

In severe cases, a broken valve spring can result in valve-to-piston contact and major engine damage.

When Should You Replace Valve Springs?

Valve springs should be inspected whenever the cylinder heads are removed and replaced if any signs of fatigue or wear are detected.

Replacement is strongly recommended:

  • During complete engine rebuilds
  • During cylinder head refurbishment
  • On high-mileage engines
  • When installing performance camshafts
  • If valve float is present
  • When spring tension falls below specification
  • During preventative maintenance on restoration projects
  • Whenever a spring shows signs of corrosion or damage

Many experienced Porsche engine builders replace all valve springs during rebuilds to ensure consistent valve train performance and long-term reliability.



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

90110590151
90110590150
90110590151

The product you are viewing cross references to these numbers
Valve guide exhaust / inlet standard size. Porsche 911 1965-89 OE Ref: 93010432100 - 93010432100
4
Valve guide exhaust / inlet standard size. Porsche 911 1965-89 OE Ref: 93010432100
93010432100/1
Product Information
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Valve guide standard. Inlet and exhaust. 12 required per engine (price is each)

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
93010432100

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Inlet / exhaust valve guide 1st Oversize. Porsche 911 1965-89 - 93010432150
4
Inlet / exhaust valve guide 1st Oversize. Porsche 911 1965-89
Special Order item
93010432150
Product Information
Product Information
Valve guide 1st oversize. Inlet and exhaust.
12 per engine. Price shown is for each.



Fits:
Porsche 911 1965-89

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

Click 'Zoom in' for large parts diagram.
Diagram Ref No 2.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

93010432150
93010432150

The product you are viewing cross references to these numbers