[BoostSlideWayz]

Are you 100 % sure your engine is not locked up or really tight from being freshly rebuilt ?

I would get a breaker bar and just remove the fan and get a large enough socket to fit on the crank pulley and just turn it over by hand.. See how it feels.. sometimes you can actually feel alot just by doing that like if its really tight or seized or if there is any excess friction.