I have many dif ones for odd needs. Air is good until your springs get over 350 or the head is so tall and the valve lift is well over an inch. some of the nicest ones are useless at times. I do use a worm or screw type for the 400lb stuff and its a modified c clamp with plenty of room for raised runner racing heads of all types. I use a big drill press as a work table for some of these cummins with a tool welded up to fit dif springs. just chuck up your tool and push em down. its fast but u must push the head around.
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