If you are doing your own tune-ups and setting your valves, you'll need these.
These are the same feeler gauges we use in the Sierra BMW Service Department!
Each gauge is stamped with the size and color coded. Airheads require one each .10 and .20 for intake and exhaust respectively. Oilheads and hexheads require two each of the .15 and .30 for intake and exhaust respectively.
Wurth Professional Feeler Gauges
Produced by Wurth of Germany