the race pump fuel pumps are awsome they work and work hard for ya i use nothing but on all my motors and i run alky just by a good regulator to handle the flow and volume! just some info for ya my machine shop and i put together a 540 on strait up 93 octane with a nickerson carb dynoed at nickerson's first shot 587 horse and 512 ftlb 4800 degreed the cam to rpm side egt was lean alittle threw a jet change at it went for another pull bingo 610 hp and 530 ftlb torque all on a race pump fuel pump now thats gettin it my machinst made nickerson a beliver he now sells them i think that should answer some mystery about the product good luck with what ever you do joe g 8)