The Rollmaster true roller timing sets have been available for a number of years now for the Ford Y-Block family of engines. These have been a big plus for those engine builders that go to the extra effort of degreeing in the camshafts as the lower crankshaft gear is keyed for nine different camshaft positions. Before these Rollmaster timing sets came to market, degreeing in the camshafts on the Y involved offset keys or broaching new keyway slots in the crankshaft or camshaft timing gears. The offset keys were always questionable strength wise regardless if the valve spring pressures were increased or not. The practice of broaching new keyway slots in the gears is not an exact science when it comes to getting the new keyway in the exact ‘right’ location. The Rollmaster timing sets eliminates those prior difficulties.