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Tech / General EngineIs your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!
Usually there's a plastic or aluminum cap, but it's not unusual for it to be missing. Kind of like the valve cap on a wheel. Some people never put the cap back on.
If you can't find a cap of another gm 80-90s car in the junk yard a an 4 cap will work.