Roberto Clemente’s three-run, 450-foot home run powers the Pirates to their fourth straight exhibition victory. Clemente’s blast follows 8th-inning singles by Manny Mota and Gene Alley and, judging from its epic dimensions, the early indications are that manager Harry Walker’s call for increased power and run production from his already-raking right fielder has not fallen on deaf ears. And just in case these indications are somehow too subtle or ambiguous, Clemente will amplify them by about 50 feet on March 24th.