im curious,who is making these cylinders for you?Its hard to believe that you can mass produce a topend that gives you 50hp by just bolting it on,now understand if someone is making these for you your design and what they can produce for you will be different because there has to be compromises in casting the product.Are these totally different castings?I ive built to many and tested to many blaster engines,50hp is not easy to get out of any cylinder without having such a peaky powerband on top of that using a standard crank.Id like to know details as well