Changing all eight injectors question

Yea, I guess I should check them before spending all that green. I've been through the glow plug circuit from one end to the other, new glow plugs, checked circuit out with clamp on DC meter and that part is working perfectly.

This truck is growing on me so I'll keep it for a few years I just want to avoid head aches along the way. I assume Armature clearance will be the distance between what moves and what doesn't move, is the check point right there on the very top of the injector?

Thanks a million!

Great info here, thanks! I may look into a rebuild assuming it's less expensive then buying rebuilts on core. I have other things to drive so I may park this beast, pull the VC's and get busy, after vacation that is...