This is a little off topic... but do you know anything about the VW 1E 2.4L petrol straight six used in LT vans? I have heard they made one based on a D24 block but with a gas engine head and pistons, same displacement and everything. It would be a neat project to get a Volvo with a blown up D24, then swap one of these gasser straight sixes in and build it up for big power. Since its a gas engine in a diesel block it would probably never wear out in a million miles... and the turbo manifold off a D24T would probably bolt right up, so adding a turbo would be easy. They sound smooth...
http://www.youtube.com/watch?v=of_1wJDP6dA