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If you are talking about the crossfire they are about 550 cfm together. I have mine bored out to 2 inches. (Factory is 1 11/16) after boring it will flow about 660 cfm. As far as injectors the ones from Turbo City are the biggest and best I have ever found and they are 68 lb cop car injectors. I think some place made bigger but not at this value. I think they are arround $120. One problem. It is pointless to put bored out throttle bodies on a stock intake. The intake can only flow about 550 cfm. So you need to get an X-ram or port your stock intake.
THANKS JONUS FOR THAT WEB ADDRESS. I HAVE AN INTAKE AND THE TB ON THERE WAY. I'VE ALREADY DONE PRETTY MUCH ALL I CAN THAT MOTOR, I WANT MORE POWER AND I THOUGHT THAT WOULD BE THE WAY TO GO. THANKS :chevy :auto: