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Cylinder Head / Camshaft Carrier

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DISPLAYING 17 to 19 (of 19 products)
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90012300500
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Product Information
Seal ring for camshaft housing. A12 x 16.
Sold each.

Fits:
Porsche 911 1974 - 1989
Porsche 964 Turbo 3.3L 1990 - 1992 (Engine code: 3069)
Porsche 914-6 1970 - 1976

Diagram ref no 17

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Related, superseded, cross reference or alternative numbers for comparison.

90012300500
90012300500

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Special Order item
99903108302
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Product Information
Washer for cylinder head nut.

porsche

Fits:
Porsche 911 1965-77
Porsche 930 Turbo 1975-77
Porsche 914-6 

Click 'Zoom in' for large parts diagram.
Diagram ref no 17

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Related, superseded, cross reference or alternative numbers for comparison.

99903108302
99903108302
99903108301

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99903108302/1
Product Information
Product Information
Washer for cylinder head nut
This OE Match washer for the cylinder head nut is a replacement engine fastening washer for Porsche 911 models from 1965 to 1977 and Porsche 914-6 models. It is designed to match the original-style fitment and support correct cylinder head nut clamping.
Sold individually

Fits:
Porsche 911 1965 - 1977
Porsche 930 Turbo 1975 - 1977
Porsche 914-6 

Diagram ref no 17

The washer sits beneath the cylinder head nut and helps distribute the clamping load evenly across the mounting surface. This supports correct fastening of the cylinder head assembly and helps protect the mating surfaces from damage during tightening.

Functions
•  Fits beneath the cylinder head nut
•  Helps distribute cylinder head nut clamping force
•  Supports correct cylinder head fastening
•  Helps protect the mounting surface from nut damage
•  Replaces worn, missing, corroded, or damaged original washers
•  Suitable for engine rebuilds, cylinder head work, and top-end servicing
•  OE Match replacement for classic Porsche engine repair.

Why Replace This Part?
Cylinder head nut washers can become worn, distorted, corroded, marked, or damaged during removal and refitting. Reusing damaged washers can affect clamping consistency or damage the mounting face. Replacing the washer during cylinder head service or engine rebuild helps ensure the fastener seats correctly and supports reliable engine assembly.

When to Replace This Part
•   The cylinder head nuts have been removed
•   The original washer is missing, worn, corroded, or distorted
•   The washer face is marked, damaged, or no longer flat
•   Cylinder head work or top-end engine service is being carried out
•   The engine is being rebuilt or restored
•   Correct fastening hardware is required for an OE-style rebuild
•   Preventative replacement is being carried out during engine assembly.

Where it fits on the car
This washer fits in the engine cylinder head fastening assembly, positioned beneath the cylinder head nut on Porsche 911 and 914-6 models.

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

99903108302
99903108302
99903108301

The product you are viewing cross references to these numbers
DISPLAYING 17 to 19 (of 19 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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