That's what I thought, but wasn't sure-----you can roll the crank forward and back to see how much rotation you can get before it starts to move the cam---it will have to have several degrees of rotation if the chain is loose enough to have skipped a tooth====


Also, if the manifold is removed you can put a straitedge across the tops of th two lifters on #1 and when they are equal the crankshaft should be at zero (this will be on the overlap stroke) so the lifters would be at there RAISED/OPEN position--
maybe a little easier step in the trouble shooting process before undoing all the front end stuff--------