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In this comparison shot, it's noticeable the port window and bolt holes are in stock location. Only on the inside is the port raised, which yields a more gradual turn approaching the short turn (floor to bowl) and long turn radius (roof to bowl) for improved airflow over stock height heads (LS3/L99/L92). The taller Mast heads bolt-on, but will require longer pushrods and ignition wires. We'll cover all that is needed so almost anyone can bolt on a set of these babies.