For accurate adjustment, the engine must be completely cold. Correct adjustment is essential for maximum efficiency and minimum wear.1. Remove the distributor cap - the orange guy in the photo below. It is held on by two clips. You can see one in the photo, the second one is on the far side. (Access: engine compartment)
--Official Service Manual
6. Clean up the cylinder head covers. Who knows when the valves were last adjusted on Sixer, Kyle had to pry the old gasket out and then I cleaned up the sealing surface with the wire wheel brush buddy.
We had a fairly significant oil leak after this task, which Kyle has attributed to excessive grease on the cylinder head covers. However, it is said that if your bus isn't leaking oil, you're probably out of oil. Always travel with a spare quart or two.