垫圈

Inlet / Intake Manifold Gasket, SET OF 6.
Flat intake manifold gasket it used between the intake manifold runners and the cylinder head on Porsche flat-six engines. Each gasket seals one intake port pair; a complete engine typically uses six of them.

Fits:
Porsche 911 1974 - 1983  - 6pcs required

Diagram ref no 7.

This set of six intake manifold gaskets provides a complete gas-tight seal between the intake manifold and cylinder heads, ensuring that all air entering the engine follows the correct metered path through the CIS or fuel-injection system. By eliminating air leaks at the manifold flanges, these gaskets help maintain proper air–fuel mixture, support smooth idle and drivability, and prevent lean conditions that can raise combustion temperatures.

Over time, manifold gaskets naturally harden, shrink or crack from heat cycles, fuel vapour exposure and age. When this happens, the engine may draw in unmetered air, resulting in rough idle, poor cold running, lean mixture symptoms, hesitation or flat spots during acceleration. Vacuum leaks also make tuning more difficult and can lead to increased fuel consumption. Replacing old gaskets with a fresh set of six restores full sealing integrity, stabilises idle and mixture control, and helps the engine operate as intended.

When to replace
You should replace the full set of inlet manifold gaskets if:
• You are rebuilding or refreshing the top end of the engine.
• There are suspected vacuum leaks around the intake manifold.
• The engine shows rough idle, hunting, or lean-related symptoms not traced to other components.
• The existing gaskets are cracked, brittle, or oil/fuel soaked.
• You are upgrading, servicing or adjusting the CIS / intake system on a classic 911 or 930.

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