Sup guys got 02 5.3 and I torqued the main and rods and motor won't turn. I got the heads on and the plugs are out. Cam is in along with the rockers, pushrods, and those are torqued also. I just untighten the mains and the Motor turn fine. I torqued the main to 15 ft lbs and 80 degrees

 

Your sure your main bearings are right? Did you use stock or aftermarket bearings?

 

These are stock std bearing

 

Did you use a degree gauge?

 

No I didn't this is my first rebuild

 

Post a pic of all 5 main caps.. My guess is you have one turned around. And in that case it won't spin, even if the caps are from another motor the crank won't spin..

 

Wrong or swapped main caps, incorrect bearings or bent crank.

 

Degree wheel are cheap at part store. Likes dirt track said, you may have one on backwards.

 

 

I had to sets of mains . I had a set of 00 and 01 mains . I'm rebuilding the 00 with 01 mains I'm going to switch the mains