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Design 911 Design 911 supply Porsche parts, Porsche spares and Porsche accessories, to both retail and to the trade. Our Porsche product and accessory range includes brakes, exhausts, tyres, wheels and Porsche panels and interiors. https://www.design91.uk/images/schemaLogo.png https://www.design91.uk/images/schemaLogo.png +443456003478 https://www.design91.uk Facebook Instagram

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DISPLAYING 17 to 21 (of 21 products)
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99970721540
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Product Information
Spark plug tube seal - 27.94 x 5.33

6 Required per engine; sold individually.

Fits:
Porsche 986 Boxster / Boxster S 1997-02
Porsche 996 C2 / C4 1998-01

Click 'Zoom in' for large parts diagram.
Diagram ref no 29

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99970721540
99970734340
99970734341
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99970721540/1
Product Information
Product Information
Replacement spark plug tube seal - 27.94 x 5.33

x6 required per engine; sold individually.

Fits:
Porsche 986 Boxster / Boxster S 1997-02
Porsche 996 C2 / C4 1998-01

Click 'Zoom in' for large parts diagram.
Diagram ref no 29

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Related, superseded, cross reference or alternative numbers for comparison.

99970721540
99610532552
99970734340
99970734341

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Special Order item
99970734341
Product Information
Product Information
Replacement spark plug tube seal - 25.07 x 2.62

6 Required per engine; sold individually.

Fits:
Porsche 986 Boxster / Boxster S 1997-02
Porsche 996 C2 / C4 1998-01

Click 'Zoom in' for large parts diagram.
Diagram ref no 28

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Related, superseded, cross reference or alternative numbers for comparison.

99970734341
99970734340
99970721540

The product you are viewing cross references to these numbers
Special Order item
99610532552
Product Information
Product Information
Replacement spark plug tube. 

Sold individually; x6 required per engine.

Fits:
Porsche 986 Boxster / Boxster S 1997-02
Porsche 996 C2 / C4 3.4L 1998-01

Click 'Zoom in' for large parts diagram.
Diagram ref no 27

*Please note that Genuine Porsche spark plug tubes do not come with replacement o-rings. We recommend replacing the o-rings at the same time. They are available for purchase separately, and you will be prompted to add them to your basket during checkout.

Related reference numbers
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99610532552
99970721540
99970734341

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Best Price
99610532552/1
Product Information
Product Information
Replacement spark plug tube with new o-rings.
This spark plug tube is engineered as a direct replacement for the original Porsche spark plug tube. It provides a sealed, precision-fit channel through the cylinder head for the spark plug, preventing coolant ingress while supporting proper plug alignment and ignition performance.
Sold individually, 6 required per engine.

Fits:
Porsche 986 Boxster / Boxster S 1997 - 2002
Porsche 996 C2 / C4 3.4L 1998 - 2001

Diagram ref no 27, 28 and 29.

The spark plug tube provides a protective and sealed passage for the spark plug through the cylinder head. It:
Supports and protects the spark plug from contamination by engine coolant
 Prevents coolant intrusion into the spark plug well
 Maintains electrical insulation and correct plug orientation
 Helps preserve consistent ignition performance and combustion integrity

Spark plug tubes are subjected to age, heat, coolant chemicals, and vibration. Over time the tube can stiffen, crack, or lose sealing effectiveness, allowing coolant to seep into the plug well. This often leads to misfires, poor starting, coil damage, or electrical shorts, and is a common service item on aging Porsche M96 engines. Replacing compromised tubes with a high-quality OE Match spark plug tube restores the correct seal and prevents expensive ignition coil or wiring damage, especially during engine rebuilds, head gasket services, or preventative maintenance.

When to replace:
  During cylinder head removal or service
  Evidence of coolant in spark plug wells
  Misfires or ignition issues traced to moisture/coolant
  Cracked, brittle, or deteriorated tube material
  Preventive refresh on high-mile engines

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

99610532552
99970734341
99970721540

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DISPLAYING 17 to 21 (of 21 products)
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About Cylinder Head / Camshaft Carrier

Precision Cylinder Head & Camshaft Covers – Engine Protection and Performance for Porsche Models

The cylinder head and camshaft covers play a vital role in protecting key engine components such as the valvetrain, camshafts, and cylinder head from dirt, debris, and oil contamination. Beyond protection, they ensure proper oil sealing and ventilation — maintaining consistent lubrication and pressure balance within the engine.

At Design911, we offer a wide selection of precision-engineered cylinder head and camshaft covers for both classic and modern Porsche engines. Crafted from high-grade aluminium, magnesium, and composite materials, these covers provide a perfect fit and long-lasting reliability while maintaining the clean, professional look expected from Porsche’s performance heritage.

Whether you’re restoring an air-cooled 911 or servicing a high-output 992, our manufacturer-quality components ensure leak-free operation and exceptional durability.

What Do Cylinder Head and Camshaft Covers Do?

These components serve as the protective shell for your engine’s valvetrain and upper oil channels. They keep contaminants out, manage internal pressure, and help maintain consistent lubrication.

Core Functions:

  • Seal the upper engine area, preventing oil leaks and contamination.
  • Protect the camshafts and valve train from debris and moisture.
  • Regulate crankcase ventilation, supporting optimal engine breathing.
  • Maintain correct oil flow for cooling and lubrication efficiency.

They are essential not only for reliability but also for maintaining the visual and mechanical integrity of your Porsche’s engine bay.

Why Do Cylinder Head / Camshaft Covers Fail?

Over time, heat, pressure, and oil exposure can degrade materials, seals, and gaskets. These issues can lead to leaks, poor ventilation, and even oil starvation in extreme cases.

Common Causes of Failure Include:

  • Cracked or warped covers from repeated heat cycles.
  • Degraded seals or gaskets, causing oil leaks.
  • Loose or fatigued fasteners, leading to uneven sealing pressure.
  • Blocked breather passages, increasing internal pressure.
  • Corrosion or contamination in older engines.

Replacing worn covers and seals restores oil control, prevents leaks, and preserves long-term engine health.

Why Replace with Precision-Engineered Covers?

Upgrading or replacing your covers ensures your Porsche engine operates as intended — leak-free, properly ventilated, and visually clean.

Key Benefits:

  • Restores sealing performance and eliminates oil leaks.
  • Protects vital valvetrain components from dirt and debris.
  • Maintains proper crankcase pressure and oil control.
  • Crafted from premium materials for superior heat and corrosion resistance.
  • Perfect fitment and finish, ensuring long-term reliability.
  • Compatible with a wide range of Porsche models, from classics to modern GT cars.

Precision covers also contribute to the engine’s aesthetic, maintaining the refined look Porsche owners expect.

Highlights:

  • High-strength cylinder head and camshaft covers for Porsche engines.
  • Precision-machined sealing surfaces for long-term oil-tight performance.
  • Manufacturer-quality materials – aluminium, magnesium, and composite options.
  • Improved oil control and internal ventilation. Ideal for engine rebuilds, upgrades, or restorations.
  • Compatible with air-cooled and water-cooled Porsche models.

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