I think it is just the bolt pattern, either that or the width or length could also be an issue. It could even bee the way the holes for the coolant/oil line up. there is a lot of things it could be lol Idon't know exactly though. And I don't believe there is a way to mod it to fit or you would have hear about it. I wounder to myself sometimes who the crazy man who first did the vovlo head mod was. That is just like wow you know, needs some good fabing, some great welding and lot of time and cash. I applaud the man
This constant mindless babel brought to you by Aaron :P