Generally speaking turbo motors have pistons with the rings farther away from the face to keep them from the heat. Also, they tend to be lower compresion. Not to mention the cams have different characteristics to make it all work out. And it helps if the pistons and heads are ceramic coated. It just so happens I just bought a PRV motor for a delorean with turbo manifolds on it, because I will be fully building this motor up for proper turbo useage. I will probally put my progress or at least the finished product on my website. This way my car will not have more weicht back there as with an engine swap, but it will fly. Casey [Non-text portions of this message have been removed]