Rocker Arms & Tappets

Billet camshaft follower kit.
Complete kit of 12 x rocker arm, 12 x rocket shaft and 12 x adjuster screw

Fits:
Porsche 911 - 1965 to 1989
Porsche 964 - 1989 to 1994
Porsche 993 - 1994 to 1998

9m Racing 911, 964 and 993 camshaft follower kit - the best items you can buy for all high rpm and high lift race, air-cooled engine applications.

The 911 / 964 and 993 rockers are CNC machined from triple melt (high purity) alloy steel, hardened, ground, micro-finished and diamond-like carbon (DLC) coated to reduce friction and wear on the pad. 911/964 rockets from standard are drilled for oil holes, while the 993 have no such holes. Ours, come drilled and fit both applications

Each rocker has detailed CNC machined work to reduce the weight to a minimum which allows for full contact on high lift cam lobes for up to 15mm of valve lift.

The 911 / 964 and 993 mechanical rocker shafts are also DLC coated to run in the steel bore of the rockers with less friction & wear compared to stock bronze bushes.

To complete the installation are the DLC coated "elephants feet" adjusters which significantly lowers the wiping friction between the foot and top of the valve to reduce valve and valve guide wear.

Diagram ref no 27, 31 and 32

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9M93010504300

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Feeler gauge with blade



Fits:
Porsche 911 1965-89
Porsche 964 - 1989 to 1994
Porsche 356
Porsche 914/6

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00072121320

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Rocker arm bush. Semi finished. Requires machining.

Width: 26mm
Shaft dia: 18mm
Housing dia: 20mm
Bronze coated steel back

Fits:
Porsche 911 1965-89
Porsche 964 1989-94
Porsche 993 1994-97


Click 'Zoom in' for large parts diagram.
Diagram ref no 31

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90110534101

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Rocker arm pan-head screw. M7 x 48.
Sold each.



Fits:
Porsche 911 1965-89
Porsche 964 1989-94
Porsche 914-6 1970-76

Click 'Zoom in' for large parts diagram.
Diagram Ref No 28

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PCG06700800

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Rocker arm pan-head screw. M7 x 48.
Sold each.

Fits:
Porsche 911 1965-89
Porsche 964 1989-94
Porsche 914-6 1970-76

Diagram Ref No 28

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PCG06700800

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Rocker arm screw.



Fits:
Porsche 911 1965-89
Porsche 964 1989-94
Porsche 914-6 1970-76

Click 'Zoom in' for large parts diagram.
Diagram ref No 32.

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90110537002

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Rocker Arm Adjustment Screw 
Sold each

The Porsche Rocker Arm Adjustment Screw is a vital valve train component used on Porsche 911 and Porsche 964 models from 1965 to 1994. This precision-engineered adjuster screw allows accurate setting of valve clearances, ensuring the correct relationship between the rocker arm and valve stem for smooth engine operation and optimal performance.

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 32

In Porsche's iconic air-cooled flat-six engines, valve clearance adjustment is a critical maintenance procedure. The rocker arm adjustment screw enables technicians to set valve lash precisely, helping maintain correct valve timing, efficient combustion, reduced valve train wear, and long-term engine reliability.

Whether you are carrying out a routine valve adjustment, rebuilding a cylinder head, or restoring a classic Porsche engine, replacing worn adjustment screws helps ensure accurate valve settings and dependable valve train operation.

What Does the Rocker Arm Adjustment Screw Do?

The rocker arm adjustment screw is used to establish and maintain the correct valve clearance between the rocker arm and the valve stem.

Its primary functions include:

• Allowing precise valve clearance adjustment
• Maintaining correct valve lash specifications
• Supporting accurate valve timing
• Reducing excessive valve train wear
• Ensuring smooth engine operation
• Helping maximise engine performance and efficiency

Correct valve clearance is essential on air-cooled Porsche engines, as thermal expansion during operation can significantly affect valve train geometry.

Why Does the Rocker Arm Adjustment Screw Fail?

Over time, the adjustment screw is subjected to constant mechanical loading, heat cycles, vibration, and repeated adjustment procedures.

Common causes of failure include:

• Wear on the adjustment tip
• Surface pitting or scoring
• Metal fatigue Excessive valve train loads
• Poor lubrication conditions
• Incorrect valve adjustment procedures
• Corrosion during long-term storage
• Damage caused during engine rebuilds or maintenance

As wear develops on the adjustment surface, maintaining accurate valve clearances becomes increasingly difficult.

Common Symptoms of a Worn Adjustment Screw

A worn or damaged rocker arm adjustment screw may cause:

• Excessive valve train noise
• Difficulty achieving correct valve clearance
• Frequent valve adjustment requirements
• Inconsistent valve lash measurements
• Reduced engine performance
• Increased wear on valve stems
• Rough running or poor idle quality
• Premature wear of related rocker arm components

In severe cases, excessive wear can affect valve timing accuracy and contribute to accelerated engine wear.

When Should You Replace It?

Replacement is recommended whenever wear is identified during inspection or engine servicing.

The adjustment screw should be replaced:

• During valve adjustment procedures if wear is found
• During cylinder head rebuilds
• During complete engine rebuilds
• When valve train components are being renewed
• If the adjustment tip is pitted or damaged
• When accurate valve clearance cannot be maintained
• During preventative restoration work
• On high-mileage engines showing valve train wear

Many Porsche engine specialists replace adjustment screws during major engine work to ensure consistent valve train geometry and long-term reliability

Related reference numbers
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90110537002

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Rocker arm shaft bushing.



Fits:
Porsche 911/912 1965-89
Porsche 964 1989-94

Click 'Zoom in' for large parts diagram.
Diagram ref no 26

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90110534403

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Rocker arm shaft bushing. 
This rocker arm bush is an replacement bushing that supports the rocker arm/rocker shaft interface in the cylinder head. Manufactured to OE-style dimensions, it restores correct rocker shaft support, helps reduce valvetrain noise, and promotes smooth, consistent valve operation - ideal for top-end servicing or engine rebuilds.
Sold each, 12 required per vehicle.

Fits:
Porsche 911/912 1965 - 1989
Porsche 964 1989 - 1994

Diagram ref no 26

Worn or loose rocker arm bushings allow excessive shaft play, leading to noisy valve trains, inaccurate lift, premature shaft wear, and eventual valve timing issues. Replacing them with OE Match bushings during engine overhaul or top-end servicing restores proper geometry and prolongs the life of the valvetrain.

When to replace:
•  Crankshaft or valve train noise
•  Excessive lateral shaft movement
•  High-mile engine rebuild
•  During rocker shaft removal/service
•  Preventive maintenance

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90110534403

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