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FULL DYNO RESULTS-340 PROMAXX VS 345 AFR-CHEAP VS BRAND NAME? CHECK OUT THIS VIDEO COMPARING THE FULL CNC PROMAXX 340 BBC HEADS AGAINST THE AS-CAST AFR 345 HEADS. WE TESTED BOTH HEADS ON A 11.0:1 572 BBC STROKER EQUIPPED WITH A SOLID ROLLER CAM, MOROSO OILING SYSTEM AND SUPER VICRTOR INTAKE. BOTH HEADS PROMISED 800 HP AIRFLOW NUMBERS. WHO DELIVERS, AND AT WHAT PRICE?