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Initial planning includes performance targets and key engine parameters and specifications. In the case of this 383 cubic-inch circle track engine, a key goal was to achieve approximately 500 horsepower and 500 ft-lbs. of torque in an rpm range best suited to circle track racing. Here Brian Divis (right) explains to Dru Freese some of the block, piston, and connecting rod specs that will form the basis of this new engine.