The cab is over the engine and it does not tilt "open".

Check the cab floor for removable covers and panels. That is how you should be able to get to the parts for a tune-up.

There might be other removable access panels under the cab - they are the equivalent of removable inner fenders.

Enjoy yourself. You have to be a contortionist when you have to work on some parts of the engine.

Spanky is the COE expert. He'll check in with comments soon.

Bill Marlow has a 46 Chevrolet COE.