HOLLEY MID-RISE (DUAL 4150 TB)
It seems the Holley Mid-Rise needed more airflow, as replacing the single throttle opening with the dual 4150 throttle-bodies definitely improved the power output. The change also shortened the runners slightly. Equipped with the dual 4150 throttle-bodies, the Holley Mid-Rise produced 577.8 hp and
507 lb-ft of torque.