Long story short. Rebuilt a 201d for my 4500TLB. New head, inj pump, oil pump, pistons, rings, sleeves, bearings...almost all new. Machine shop installed sleeves, checked block and rods. Rebuilt the head. Crank measured good and was nice...no gouges etc. I assembled motor. Engine was tight to turn over but nothing out of ordinary...turned multiple time adjusting valves. Installed in TLB and starter made 1/4 revolution and motor is bound tight. Cant move it in either direction. This is with 4ft pry bar! Pulledc it out removed clutch and flywheel but no joy turning it. Any ideas? Rods in backwards? bearing in wrong? Only thing left on motor is PS pump. Timing issue? Timing marks are simple to follow so I don't think this is the case. I enjoy rebuilding but only once. Any help would be greatly appreciated. Thanks