When i was trying to unstick my motor, i was going thru the samething. My motor had thick like tar oil from setting all those years which was unknown how long. I had the rocker rusted and had to do like jerry said tap the pistons out. The only thing i could not get out was my lifters which the machine shop had to remove. I think mine was a worse case senerio. Now everything is go to go. Patience is the key.

"As I lay rubber down the street, I pray for traction I can keep, but if I spin and begin to slide, please dear God protect my sweet ride." -Amen

56 Chevy 3100