970cc Big Bore to fit to CB750 SOHC 1969 - 1978 Kit, 70mm pistons, H beam rods, sleeves, conrod bearings and head gasket. Machining available, I can resleeve your barrel, bore the top case to suit O/S sleeves, valve service head or big valve and porting work, lighten crank deball and clean and balance or if I can do the whole engine.