ddec34

I have just changed cylinder heads on a 2006 E7. The old heads just had a problem with the soft plugs and installed exchange Mack factory heads. When I went to start the engine, it sounds like a compression release is on, there's no compression and the engine is spinnig freely. I don't know what is going on. The valve train looks good and I didn't have to make much adjustment on the rockers from the old heads to the new heads. Does this engine have some weird compression release I...