Bull whippets

just out of interest mate, how they bred, ho much  pit, to the whippet ?  i know that none ped racing whippets are game little dogs, some of the males used get to 34 lb  22 in  , they pile into a fox no prob , they have staff , in there genes , good little dogs. ive had pit x greys over the years , so know what the pit offers to any lurcher line , drop of pit goes long way deff, not after pup right now , but think this x wnen bred right make good little lurchers  deff .   any pics of parents  ?                 Ray