there are a few ways to look at that,
1) spend the few extra dollars & let the machine shop put it together. so many
people think hell anyone can slap some pistons & bearing in. but they don't
realise that is what you pay for check, double check & triple check.
2) ALWAYS recheck every ones work, people are human & they make
mistakes.
3) if the bearings were that tight, how did you roll it over by hand when
priming it before starting it? if you did get it to roll over you should have said to yourself this is to damn tight & made a phone call or started checking everything.