[NateS]

Okay... to my knowledge it is far easier to put a 2g head on a 1g block because the holes in the 1G heads for the head studs are bigger therefore all you really have to do is machine the 2g head stud holes out a little bigger. Putting a 1g head on a 2g block would mean that the 1g head stud holes in the head would be bigger than they need too. I would imagine this would cause problems. I figure you could machine the block and put the 1g head studs in it. You can be almost positive that there are going to a few sensor issues too.

I am actually going to put my 7 bolt head on a 6 bolt block in the near future. In my opinion, I don't think it would be worth all the work and month to do it the other way though.