Here is a comparison of the last 400's we built and dyno'd as they are about as different as you can get factory equipment-wise, but both relatively mild builds. They both had Icon forged pistons and Eagle forged H-beam rods, stock cranks, and Ferrea 1-piece SS valves. The W72 400 had only 8.75 compression and the Summit 2800 cam, but with factory RA exhaust manifolds. They both run their respective year cast iron intake manifolds and Q-jets, as well as factory stamped steel 1.5 rocker arms.
Dennis
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