I take it you’re referring to the cam shaft split-gear for gear lash, correct? If so, then yes, both halves have to be lined up using an alignment bolt during reassembly. Only thing is, if you already have the camshaft bolted down, it’s going to need to be unbolted and removed in order to get the correct alignment against the spring tension. If I’m not mistaken, without the alignment bolt installed you will be one tooth (maybe two) off and you will have a very noisy valve train, that prolly wouldn’t last too long. Don’t be tempted to try and loosen up the cam caps and make the alignment- you could end up damaging the valves or camshaft. Fully remove the camshaft and gently rotate the inner gear to match the outer gear and screw in the alignment bolt. The spring tension should feel very robust. You should be able to get the cam gears and crank aligned correctly with the bolt inserted (insert from center of engine towards the fender). Whatever you do, don’t forget to remove the alignment bolt when everything is torqued back down correctly and BEFORE you do your hand turning of the engine to manually check your timing alignment. I’m pretty sure that bolt head would hit something and possibly crack your head! VERY IMPORTANT!! Good luck!