OE Match

Cam belt tensioner. Porsche 944S / 968



Fits:
Porsche 944S 2.5L 16V 1987-91 M44.40
Porsche 968 1992-95 all models M44.40

Click 'Zoom in' for large parts diagram.
Diagram Ref No 9.

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94410563110

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Piston ring set. OEM Brand Ring Set. 6 sets per engine. Price is for 1 set.

ø93 mm, Ringe 1,20 x 1,50 x 2,00 mm

These are better than the original & have been tested by many engine rebuilds.
Top Ring and Bottom rings = Stainless CAS Nitrided
Middle Ring = Cast Iron

Fits:
Porsche 986 3.2L Boxster 1999-04
Porsche 987 3.2L Boxster 2005>>
Porsche 955 4.5L Cayenne S 2003-06

Diagram Ref No 2

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99610303351

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Pop off air valve.

Fits:
Porsche 911 1973-89

Prevents costly airbox explosions, installed with the engine and air box in place. 911 engines since 1973 have had the bad habit of backfiring and blowing a hole an the air box. 911 POP VALVE is installed inside the air box and when a backfire occurs the valve will instantly open and release the backfire pressure. The POP VALVE then automatically closes and the angine continues to run. The POP VALVE has no effect on the performance or fuel mileage.

CIS Pop Off Valve Installation Click Here

For Fitting Instructions CLICK HERE

Please note the glue is not included with the air valve.

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911901522

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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.

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.        

• 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)

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

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

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93010432100

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Valve spring
This spring pair fits all 911's from 1965 to 1994.



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

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Diagram Ref No 13.

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90110590151

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Rocker arm screw. 
The valve-adjusting screw (also known as rocker-arm screw) is a replacement component for the cylinder-head valvetrain on classic Porsche engines. Allows proper adjustment of valve clearance, ensuring the rocker or follow-arm correctly contacts the cam lobe, maintains correct valve train geometry and ensures smooth, reliable engine performance.
Sold each.

Fits:
Porsche 911 1965 - 1989
Porsche 964 1989 - 1994
Porsche 914-6 1970 - 1976

Diagram ref no 32.

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90110537002

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Rocker Arm.
Restore precise valve actuation and engine performance with our OE-match Rocker Arms.
Not to be used with performance camshafts. 

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

Diagram Ref No 31

Why Replace This Part?
Worn or fatigued rocker arms can lead to improper valve lift or seating, reduced compression, misfires, elevated emissions, and may affect overall engine reliability. Upgrading to a high quality OE Match rocker arm restores the integrity of the cam-to-valve train and helps maintain optimal engine performance and longevity.

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93010504305

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Camshaft timing gear / Drive sprocket.
This camshaft timing gear is a direct-fit replacement for the factory Porsche drive gear, it ensures accurate chain engagement, quiet operation, and long-term reliability. 
Fits: Left or Right, Sold each.

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

Diagram ref no 22.

This sprocket (gear) is part of the timing / camshaft drive system, engaging with the timing chain (or drive chain) to convert crankshaft rotational motion into synchronized camshaft motion. It ensures that the camshafts open and close valves at the correct moments relative to piston position, essential for proper combustion, engine efficiency, and emissions. Accurate tooth profile, hardness, and alignment are crucial—improperly manufactured or worn sprockets can lead to timing drift, noise, chain jump, or catastrophic engine damage.

Original stock / old timing gears can wear, fatigue, or lose tooth integrity over time — especially under heat cycles and chain load. A worn or mismatched sprocket may cause timing chain noise (ticking, rattle), timing drift, or—worst case—chain jump or engine damage. An new replacement restores correct tooth geometry, material hardness, and precision alignment, ensuring the timing system operates smoothly and reliably.

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90110554604

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Crankcase through bolt o-ring.
24 per engine.



Fits:
Porsche 911 1965-89

Click 'Zoom in' for large parts diagram.
Diagram ref no 22.

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99970100640

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Engine head studs upper standard.
Price is for each.

Fits:

 (12pcs Required)

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)

(24pcs Required)
Porsche 911 2.7L Carrera 1973

Diagram Ref No 2

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91110117200

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Tensioner spacer. Standard type not upgrade type.
Should be fitted with 93010505300 above.



Fits:
Porsche 911 1968-83
Porsche 930 Turbo

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93010551300

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Chain guide rail, Black.
This guide rail maintains correct chain alignment, reduces wear on the timing chain and sprockets, and helps ensure accurate cam-shaft to crank-shaft timing over the life of the engine. Manufactured to match the original Porsche geometry, this rail provides direct-fit installation and restores proper chain path, quiet operation and long service life.
Sold each, 5 required per car.

Fits:
Porsche 911 1966 - 1989

Diagram ref no 2

• Position: Timing gearcase — the guide rail that supports/locates the front timing chain (or chains), depending on engine version.

• Function: Guides the timing chain to prevent excessive slack, misalignment or premature wear; supports longevity and accurate timing performance.

The timing chain guide rail is a critical component in the timing system of air-cooled Porsche engines: if the guide is worn, cracked, warped or missing, it can cause chain vibration, accelerated wear of the chain/sprockets, timing errors, noise or even catastrophic engine damage. Replacing it with a proper rail ensures correct chain path, quieter operation and long-term reliability.

When and why to replace:
•  Timing chain slap or rattle is audible at startup or under load
•  Visible wear on the existing guide rail (grooving, cracking, deformation)
•  During engine rebuild or timing chain service when the covers are already open
•  High-mileage or track-used engines where timing-system components have extended service life.

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91110522207

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Chain guide rail, Brown. 1 per car.



Fits:
Porsche 911 1966-89

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Timing chain split link.
To be used with Part Code: 91110552951 OR 91110552951/1

Need when fitting split timing chains. Each car has two.

Fits:
Porsche 911 1965 - 1989
Porsche 964 1990 - 1994

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