I dont think you can bend them by hand... It wouldnt be hard to turn, it wouldnt turn if you were hitting valves. All 4 of his pistons might have been halfway down or up and he might have just been spinning the valves around, who knows.

 

compresdsion will be the same. 9.1 to 1

 

Spade told me basically the same. It won't change, no problems mating a z6 with a y7 block.