carb size December 02, 2009 10:07AM
Looking to put a 4 bbl on a 570 cube non turbo gasser. Have a 9 stromberg on it now, it turns 5000 rpm but isn't much good under 2000. Would a 850 cfm work good or too small or too big? Really don't want any more rpm, would be happy with less if it hold better under a load.
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Re: carb size December 02, 2009 10:56AM
( cubic inch X max rpm) / 3456 = cfm.this will get you in the ball park
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Re: carb size December 02, 2009 10:58AM
to big 750 is plenty for that amount of cubes turning 5000 rpm
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Re: carb size December 02, 2009 11:58AM
Thanks, any insite on intake runner size or length for optimal mean gas speed?
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Re: carb size December 02, 2009 01:13PM
Would need number of cylinders, bore/stroke, intake and exhaust valve sizes and lift, cam specs and at least some idea of head layout. Velocity would have to be different between a low port vs raised runners.

Length from plenum to valve head could be around 14 3/4" at 5k for a close ballpark.
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Re: carb size December 02, 2009 01:49PM
Sweet. I dint know anyone else was running 4bbl carbs. Where are you running(if dont want to say then what state)
We have a couple of 460 farmalls running 4bbl carbs.
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