The KAD 16 valve Twin Cam head conversion is simply in a different league, where A series cylinder head comparisons are made. The Twin Cam head conversions fit onto any 1275cc A series cylinder blocks. The bottom end build for Stage 1 uses A+ cranks and rods, helical drop gears and a standard 4 speed A+ box with a Twin cross pin diff. Stage one engine, small valve head, carburetted engine, 110-120bhp, capacity 1380cc. Fully built and dyno. Applications: daily use road engine, suitable for occasional track use.