I would not make such a presumption. The best way I've found is method #3 in the tech tip.
"#3 General (Engine NOT running) -- "I have a trick I use every day at work to set valves on inline 6 cyl. motors. Chevrolet and John Deere firing orders are the same: 153624. Set the motor to fire on #1. Set the lash on 1E, 1I, 2I, 3E, 4I and 5E. Then rotate crankshaft one revolution. #6 should be in firing position. Set lash on #6E, 6I, 5I, 4E, 3I, 2E. Your valves are all set, and it only took about 5 or 10 minutes. Remember exhaust valves are on the ends of the head, and they look different than intake valves, so it is easy to identify the valves for cyls. 2,3,4,5. I hope this will help someone. Again, thank you!"
