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Mike , thanks , think i just joined by following the instructions , Anyone have flow tests & how large a dia intake valves one can fit with out breaking into water jackets ? Just picked up a sacrifice block where a machine shop just cut through each valve hole to fit seats, went so large they got into water jackets then tried to braize each hole up , what a mess ,stuffed a good block , We may slice it to get an inside picture of the casting. Hot in NZ