A guy brought an non roller 5.0 into us to install in his Mustang. He said it had just had the heads done and should be good to go. Several days later Jay was checking it out and found he couldn't rotate the crank 360. It stopped real solid like in each direction. Today we pulled the heads out of curiosity and while removing the head bolts found one that had a different size head on it. Hmmm. When we pulled the head guess what we found. Surprize! The missing head bolt. I wonder how long he looked for that bolt.