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Thread: cfm ?

  1. #1
    its almost that time again Ricky Bobby's Avatar
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    cfm ?

    have a 406 thats built pretty decent want to know if a 650 double pumper would be an ok carb for it i have a 7xx edelbrock on it now and its a pos jsut dont want to have to small of a carb and choke it out, has dart intake, world product cast heads, dome pistons, cam is a mystery as this is a mystery motor was built when i bought it with no paper work sounds like has a decent cam in it when its running and does not make very much vaccum as my brakes suck need vaccum can

  2. #2
    Formerly known as Yellow Wagon jbiscuit's Avatar
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  3. #3
    its almost that time again Ricky Bobby's Avatar
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    if i calc my motor out with 85% says i still need at least a 680 spinng close to 7 but in reality wont see past 6500, so if thats correct i would be using every bit of that 650

    also lookin around the net lots are saying 750min on these motors? ah well

    wheres my taxes so i can buy a new one lol
    Last edited by Ricky Bobby; 01-27-2011 at 02:39 PM.

  4. #4
    Formerly known as Yellow Wagon jbiscuit's Avatar
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    I would say the 750 would be a good size carb for that motor too. You have a single plane dart intake on that? Put a 750 on it with a carb spacer I have about the same cubes as you with the new motor but I have quite a few more CFM in carb sitting on it
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  5. #5
    its almost that time again Ricky Bobby's Avatar
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    no its a dual plane dart intake, and ur motor is a beast compared to my junkyard shit, also if i put on a spacer stock hood would not close air cleaner is already hittin the liner
    Last edited by Ricky Bobby; 01-27-2011 at 03:10 PM.

  6. #6
    RTCTTFMF juicedimpss's Avatar
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    if you are running a tight convertor or a low-numerically gear(ie 355 or less) go with the smaller carb for sure. if you are willing to put up with a 3500-4000 stall the 750 may make marginally more power. Usually best to error on the small side for a street car
    instant throttle response > a few more HP on the top
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  7. #7
    Formerly known as Yellow Wagon jbiscuit's Avatar
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    ^ Good thought process here. I too would rather have the throttle response any day! Makes for a lot more fun
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  8. #8
    its almost that time again Ricky Bobby's Avatar
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    have a 3200 stall and shit low gears right now but might have a line on a 3:89 moser axles for 500 with posi unit(complete drum to drum)

    i just dont want to have a problem and yes throttle response would be good just dont want to have a issue with it and thats why im asking im hot rod dumb

  9. #9
    its almost that time again Ricky Bobby's Avatar
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    this site was cool
    http://holley.com/applications/Carbu...bSelection.asp

    both sites point to at least the 750

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