Hi all,
Newbie to the forum....
A couple weeks back I bought an '81 Camaro with a TH350 and a 454. Not sure of the year or what it came out of. It ran fine when I went to go look at it. And apparently the guy drove it to town to get it registered. Long story short I had it shipped home. When I cranked it, it seemed a little slow and it farted out the carb a bit like the timing was slightly off. But it started and I drove it into the garage. About two weeks later I went to start it again and it barely turned over at all. I assumed it was the battery because it was old and had been dead for a while. A fresh battery didn't help so I crawled under the car to see if the starter was dragging. The starter gear was still engaged with the flywheel. I took the starter out, and the gear went back into the housing. I then took out all the plugs (except for #7 because it was shoehorned behind the booster), and put a breaker bar on the crank pulley from below and tried to turn the motor. It would barely budge. What would cause this? Oil was full and had 40psi of pressure.

 

If it's been overhauled recently, it will be hard to turn over. You didn't mention miles.