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Hi Chuck,To carve out the inside of the lower crankcase probably took about 3 hours. As you know my technique is to make a step-off chart for the shape so it's pretty much a matter of following the numbers. I don't mean to make it sound that simple but as long as you follow the numbers it goes quite fast. I'm guessing the whole lower crankcase took between 10-12 hours. (Machining) Finishing with files and such took another couple of hours.gbritnell