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- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
OE Match cylinder head exhaust valve kit, supplied as six exhaust valves, each with a diameter of 41.5mm.
Fits
- Porsche Carrera 3.0ltr - 1976 to 1977
- Porsche 911 SC 3.0ltr - 1978 to 1983
- Porsche 911 3.2 Carrera 1984 to 1989, comprising 1984–1986 3.2L and 1987–1989 3.2L G50 applications.
Check fitment for your specific vehicle (model, year, engine) before ordering.
Diagram ref no: 10
What This Product Does
Exhaust valves open to let combustion gases leave the cylinders, then close against their seats to seal the combustion chambers. This kit provides the six exhaust valves for the listed applications; it is not a complete cylinder head assembly.
Functions
- Controls the passage of spent gases into the exhaust system.
- Seals each combustion chamber when the exhaust valve is closed.
- Provides replacement exhaust valves for cylinder head refurbishment.
Technical Details
- Contents: six exhaust valves.
- Valve diameter: 41.5mm.
- Component reference: 93010541951.
- SC application recorded in the 1978–83 cylinder head diagram.
- 1984–86 engine references: 930.20/21/26.
- 1987–89 engine references: 930.20/25/26.
Symptoms of Fault
- Reduced or inconsistent cylinder compression.
- Leak-down testing indicating leakage past an exhaust valve.
- Persistent misfiring after ignition and fuelling checks.
- Uneven idling associated with poor valve sealing.
These symptoms require diagnosis rather than confirming valve failure on their own. Oil consumption or smoke can also involve worn guides or seals, which should be assessed separately.
Why Replacement Matters
Worn, burnt or damaged valves may no longer seal correctly. Renewing affected valves during cylinder head work addresses the valve itself, while inspection of the seats, guides and springs helps establish the full repair required. Replacing valves alone does not correct wear elsewhere in the assembly.
FAQs
Does the kit contain guides, springs or seals?
The confirmed contents are six exhaust valves. Do not assume additional cylinder head components are included.
Which checks help identify valve leakage?
Compression testing and a leak-down test help assess cylinder sealing before dismantling. Inspection and measurement then determine which components need attention.
Can this be used for a top-end repair?
It can form part of cylinder head refurbishment on the listed applications. The extent of the work depends on the fault and measured wear.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93010541951
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- 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
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
The product you are viewing cross references to these numbers
- 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)
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
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
Sold each.
High-quality replacement valve designed for classic Porsche 911 engines produced between 1978 and 1989.
Fits:
Porsche Carrera 3.0ltr - 1976 to 1977
Porsche 911 SC 3.0ltr - 1978 to 1983
Porsche 911 3.2 Carrera 1984 to 1989
The exhaust valve is located in the cylinder head as part of the engine’s valve train. With every combustion cycle, it opens to release exhaust gases and closes again to preserve compression. Built to endure extreme heat, pressure, and constant motion, it plays a vital role in maintaining engine performance, efficiency, and emissions control.
Over time, exhaust valves can wear or deform due to heat, carbon deposits, or mechanical stress. When they no longer seal properly, exhaust pressure can leak past the valve seat, reducing compression, power, and efficiency. In severe cases, a failing exhaust valve can lead to misfires, rough running, or damage to the cylinder head.
You should consider replacing the exhaust valve if any of the following occur:
• Loss of engine power, especially at higher RPMs
• Rough idle or misfires
• Exhaust smoke or unusual noise from the cylinder head
• Compression test reveals a weak cylinder
• When rebuilding or overhauling the engine or cylinder head
• After excessive heat exposure or in engines with high mileage
Replacing the valve ensures precise fit, proper sealing, and long-term durability — critical for restoring engine performance and preventing further damage.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93010541951
The product you are viewing cross references to these numbers
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
Manufactured to OEM specifications, this valve matches the factory dimensions, seat angle, and stem diameter for perfect sealing and valve timing accuracy. Built from high-grade heat-resistant steel, it delivers excellent thermal stability and wear resistance, ideal for the demanding environment of Porsche’s high-revving flat-six engines.
Fits:
Porsche Carrera 3.0ltr - 1976 to 1977
Porsche 911 SC 3.0ltr - 1978 to 1983
Porsche 911 3.2 Carrera - 1983 to 1989
Valve stem diameter 9,00 mm
Length 110,10 mm
Valve seat angle 45 °
Diagram Ref No 9.
Function:
The inlet valve controls the flow of air-fuel mixture into the combustion chamber. Proper sealing and timing are essential for maintaining compression, combustion efficiency, and overall power output. A high-quality OE Match valve ensures consistent intake airflow, reliable operation, and long engine life.
Why & When Replacement Matters
Why: Over time, inlet valves experience wear from heat, carbon build up, and mechanical stress, which can lead to reduced compression, power loss, and rough engine operation.
When: During engine rebuilds or cylinder head servicing If there are signs of valve leakage, pitting, or stem wear. When experiencing loss of power, misfires, or compression imbalance. As preventive maintenance on high-mileage engines or performance builds.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93010540901
The product you are viewing cross references to these numbers