Opel CIH Ignition Point/Dwell Adjustment. Opel owners know, that the Opel distributor can "eat”"ignition points quickly. This is because the high RPM's of a 4-cylinder Opel engine, combined with improper maintenance, wears the internal distributor bushings within about 70,000 miles, and the center distributor shaft "wobbles" on the rubbing block of the point set. One symptom of worn-out points, is idle speed drops. Higher voltage, caused by failing ignition coils and circuit "resistance" wires to that coil, also results in premature "pitting" on contact surfaces of point sets.... Carburetor "Thick" Base Gasket, and (optional) Heat Shield with "Thin" Gasket: Install a "Thick" base gasket to properly seal the carburetor to the manifold or heat shield (if equipped). Use a high quality gasket sealer, such as "Permatex High Tack", on all surfaces between the top of the manifold and the bottom of the carburetor, to prevent common Opel vacuum leaks. Other gaskets, such as the Weber "fiber" gasket, are too thin to seal properly or repel heat, and the Opel plastic gasket restricts the 36mm barrel of the Weber. Installation without gasket sealer or with improper gaskets, will allow vacuum leaks to form over time. These leaks will make tuning the Weber carb more difficult, due to the resulting excessively "lean" condition. Note: Lean conditions raise internal cylinder head temperatures (which can crack the exhaust manifold). Note: In warm climates, installation of the Opel "Aluminum Heat Shield" will help shield the carburetor from the exhaust manifold heat. This heat can cause a "vapor lock" condition, making the vehicle more difficult to restart. Note: The heat shield requires an additional "Thin" mount gasket.