Can't say much on comparing the 2. But from what I've herd haucks 800. Makes the cylinder walls very thin after boring to 74.00. And I can also add that hauck has no 74.00mm pistons. I contacted them a week ago looking for 74.00mm pistons for one if there 900 stroker kits. They do have 73.00 Pistons for there 780 kits. Wiseco will make some 74.00. But u would need to order at least 10-12 Pistons for them to do a run of them. (From what hauck said)I guess what I'm trying to say is. Imo I would stay away from the hauck 800 kit. If the builder doesn't have/can't gets parts for it. But I know there is a couple builders on this sight that will build u a screaming 780.