I think I figured it out, I will find out for sure tomorrow after work. I recently purchased a 2006 vw jetta tdi from the junk yard. It had a valve drop in the #2 cylinder due to worn cam. The lifters had holes in a few of them w/ a piece of the valve sticking out of the head, and piston tore up. Surprisingly the cylinder wall only had two slight nicks in it so I got a new / used piston and rod, and a new / used head w/ cam and valves. It fit right on my block. there is one difference. the openings on the head for the intake are the split type openings (vertical piece of metal in each opening) my original head doesn't have these and my intake manifold isn't a split opening. I originally posted in the newbee forum and was told that the head was probably a BEW. After seeing another post here on this forum showing the BEW in a 2006 with a BRM head it was pointed out that the cam position sensor was modified. When I put the new head on I just used my original sensor and never paid attention to the position plate behind the timing belt pulley. but comparing them this evening see that they are different. I couldn't figure out why it wouldn't fire up but the fuel is injected to the cylinders by the position of the cam sensor. Tomorrow I am going to pull the timing gear pulley off the head I have on the car and replace it with my original pulley, with the position sensors where my computer is expecting them to be, and hopefully it will fire up. If anyone knows of anything I missed or if the cam I got won't work let me know. I will post my results tomorrow.