What's up guys. I'm having a real hard time trying to figure out why my new engine is so hard to turn over. Even turning the flywheel by hand with the glow plug out, is fricken hard. My starterbox on a full charged g cell cant turn it over. I took out the engine and tried lining it up on the starterbox and it did turn it over with out a glow plug. When I put the glowplug back on, it doesnt.

And ideas why. by the book, engine nut is tight. clutch, and clutchbell are on fine. I'm stumped???