Lifting engine block with a hoist?

I used a chaina and two factory head bolts in the deck where the heads bolt on. However, later when I used the same bolts to assemble the cylinder heads, I was surprised that the two factory head bolts I had used to move the motor had actually bent a little bit. I still was able to use them, but they turned with a little more drag than the other bolts. (I probably lifted the block including the crankshaft, rods, and pistons in the case I am describing, so the "assembly" weighed more than a bare block). I won't use engine bolts any longer to lift motors.