Does anyone have knowledge, of a 400 SBC crank(stock or scat 9000), bob weight, without the external balancer, and flex plate.( I have an external balance crank, but 350 chevy flex plate and balncer. What would the bob wieght be. Say I ran 350 flex plate and balancer. How much bob weight would I loose? I have not yet decided on pistons and rods, just trying to get an idea! Has anyone tried anything lkike that before? Thanks Everyone!!!