[cuatrokoop]

It can't be that close to an Audi engine, as the current bore spacing of even the 4.2L won't allow for much more displacement than that. The whole reason why we have the 4.2L is because Audi changed the bore spacing from the standard 88mm to 90-something. I believe all Audi V8's (3.7, 4.0TD, 4.2TD, 4.2FSI/tt, etc) since the ABH use the larger bore spacing and similar block size, which as I said, doesn't allow for much more displacement. If Audi hasn't gone larger than 4.2L in a V8 since 1991/1992 there is a reason. The V10 had a little room left despite the 88mm bore spacing, which meant it could go from 5.0L (two banks of 2480cc) to 5.2L (two banks of 2583cc IIRC).

 

[cuatrokoop]

Looks like plenty of room.....DO IT DO IT DO IT