Ninety percent of peak torque is available from below 2000 rpm to over 4000 rpm. If there's heavy towing to be done, this is the ideal powerhouse for the job. Four-bolt main bearings to support the crankshaft rigidly, reducing noise and vibration. The nodular iron crank now has internal counterweights to minimize internal stresses and bearing loads. A change in firing order reduced crank and bearing stresses by seven percent.
New pistons are shorter in both deck height and skirt length to minimize heat build up.
Smoothness and efficiency both benefit. Each cylinder is surrounded by five head bolts to assure a reliable lifetime seal with new thicker head gaskets. Hydraulic roller lifters ride on a durable steel camshaft. Stiffer ball-pivot studs support more robust rocker arms. The aluminum intake manifold is precisely made using lost-foam casting technology.