I did the math and boring the block out to get a 2.8 isn't possible, there isn't enough material. I also agree with what Eric said, though I didn't know what the rod length was untill he posted it. In the VW engines I build, we don't go any more than 82mm stroke with the stock 5.35 length rods (same in a air cooled vw as a D24... interesting). Anything above that and the rod angle is too steep and you get excessive side loading on the piston. I have heard of people building a 84mm stroke with the stock rod, but the rod almost hits the piston skirt. I guess the 86 stroke in the d24 works because of the shorter piston skirt.
Jason
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