[Question] Carb size
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Carb size

  1. #1
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    Default Carb size

    Building a new motor for my circle boat. It's gonna be a 468 bbc. Approximately 13:1 with a set of dart pro 1's. The heads are the super stock pro 1's. Cam is about .710 lift. Would an 850 be enough to feed it?

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    What do you have right now? I am a "use what you have" kind of guy so if you have an 850 already then I might use it. If you don't have a carb or intake then I would put a 1050 dominator on it and a good single plane intake. A tunnel ram would probably make more power, but then we are talking about buying two "good" carbs and intake and tuning it.

    Paul

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    Not trying to get too crazy just trying to get to 105mph.

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    Are you going to compete in competition that has rules regarding carbs?
    I'm not an expert on circle boats, so I don't know what kind of power it takes to reach your desired speed, but I'd say you may need all the carb. you can get, within reason.

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    In my view an 850 will not even be nearly enough.Do as fc-pilot says.
    Last edited by bville; 07-27-2017 at 08:49 PM.

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    Quote Originally Posted by bville View Post
    In my view an 850 will not even be nearly enough.Do as fc-pilot says.
    Old motor was a 427 with the same set up. Is there a formula you can use to determine what cfm you will need based on cubic inches and rpm?

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    There are a number of formulas out there and each will tell you what they want you to have. The 327 I built was very happy with the carb that flowed 830 and the 350 that I just finished likes a carb that flows right at 900. Those are both pump gas. With your compression and cubes and decent heads putting a basic holley 850 on would be limiting your combo. Now, that is not to say an 850 would not get you to your target (as I am sure it could) but it would make it easier. So if you don't have a carb or intake I would go with a 1050 Dominator. If you have an 850 and a good single plane I would probably run them. An 850 usually flows over 900 cfm and with a little work at your shop can flow a little more.

    Paul

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    Thanks Paul. Might have to invest in a bigger carb. I will talk to engine builder and see what he thinks.

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    Quote Originally Posted by Hondo535 View Post
    I will talk to engine builder and see what he thinks.
    I feel that will be the best idea. He will know the details of your combo better than us.

    Paul

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