750 holly

Discussion in 'Tips 'n' Tricks Topic' started by gvernak, Dec 26, 2014.

  1. legierk

    legierk Veteran Member

    Jun 11, 2014
    Waskom, TX
    Agreed......at WOT. If you drive around with your foot mashed to the floor, the 750 is the right carb (on a mild SBC). If you want off idle and part throttle snappiness (high air velocity), then the 650 is a better choice.
  2. 81_Owner

    81_Owner Veteran Member

    Sep 2, 2013
    Fairfield, Ohio

    I have an engine very similar to what you have here and found the 750 to be too much for my set up. I went down to a 650 and it runs great. Do what makes you happy, but in my experience a 650 will give you enough for street use.
  3. Patsfan54cc

    Patsfan54cc New Member

    Sep 25, 2014
    Raynham, MA
    I was looking for some help myself. I just picked up a 5.7 crate motor w/vortec heads all stock. I have a TH350 & 3.08 gears. I'm changing this over to a carb but my son-in-law & I are in a bit of a disagreement. I plan on putting a cam in (nothing to radical) & I want dual quads but he say's it will be a dog. He says go with a Demon 750. Who wants to break the tie?
    Last edited: Jan 5, 2015
  4. Rdobbs1977

    Rdobbs1977 Huge Guns N Roses Fan

    Dec 1, 2014
    If you are just going to drive it around town, a cam around the size of a 268 would give you that nice 'lope' sound. Would make it sound a lot meaner than what it is, and you wouldn't have to fool with a stall converter. Just a thought.
  5. Goodwrench1965

    Goodwrench1965 Veteran Member

    Apr 23, 2010
    Charlotte NC
    I'd say a 650 double pumper or a 650 or 750 vacuum secondary will be perfect. The vacuum secondaries are more forgiving as to size selection. You got the best brand that's for sure! Don't second guess 750 cfm if its vac secondaries its damn near perfect.

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