The 340, THE best small block ever built, bar none. Large bore , valves located on bore centerline, floating pins, cam located high in block,...BEST flowing (intake) stock as cast heads, Excellent rod ratio @ 1.85 over built lower end, ..Best small block ever. So much better than all the 'other guys' . Best kept secret ever,..NEVER receive ANY ink from Chevy craft and the other mags, you would think it was Top Secret .