Carb recommendation
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Carb recommendation

  1. #1
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    Default Carb recommendation

    I have a new Dart 9.8 deck 509 short block with eagle/srp internals, Clevite H bearings, Victor Jr intake. I dont have heads yet but am considering AFR 305's. Looking to spin around 5000 rpm or so, prob 600HP. What is the recommended carb. I have a Demon 850 in the garage but want to see what ya'll think. Thanks, Dave

    2006 Advantage 28 Sport Cat BR
    Lake Travis
    Austin, Texas

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    I've got a pump gas 565 and I'm running a Dom 1050. Very mello. Not over carbed at all.

    Maybe your 850'll work because you wanna keep the R's down, but I have my doubts.
    Is it just me or are toilet seats getting smaller?

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    Quote Originally Posted by freakdave View Post
    I have a new Dart 9.8 deck 509 short block with eagle/srp internals, Clevite H bearings, Victor Jr intake. I dont have heads yet but am considering AFR 305's. Looking to spin around 5000 rpm or so, prob 600HP. What is the recommended carb. I have a Demon 850 in the garage but want to see what ya'll think. Thanks, Dave
    The 850 should run you up to 5760 rpm -at 100% efficiency,, should work fine.................E

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    cool, thanks

    2006 Advantage 28 Sport Cat BR
    Lake Travis
    Austin, Texas

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    Dave, let that motor spin. 6000rpm's on a hyd cam is no problem these days. Your motor will thank you. Plus it's 1000 more rpm to prop for.


    Darrell.
    San Diego.

    28ft Sportcat
    With Twins

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    850 will work. 1050 will make more power.

  9. #7
    cfm
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    BG850 should flow more than a Holley 850....so I'm told.

    Either way, the 850 should be more than adequate as long as it is tuned correctly.

    5325, you really like the Dom's huh ?

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    cfm
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    Oh, wy limit yourself to 5k ? Your missing out on a lot of power and the potential of the AFR's. Go atleast to high 5k's.........you'll be thankful you did.

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    Thanks for all the input. Mid to high fives is prob what the engine will twist. Now i just need some money$$ !!

    2006 Advantage 28 Sport Cat BR
    Lake Travis
    Austin, Texas

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    Quote Originally Posted by freakdave View Post
    Thanks for all the input. Mid to high fives is prob what the engine will twist. Now i just need some money$$ !!

    X2,.....on the money, lol........E

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    Quote Originally Posted by cfm View Post
    BG850 should flow more than a Holley 850....so I'm told.

    Either way, the 850 should be more than adequate as long as it is tuned correctly.

    5325, you really like the Dom's huh ?
    Yup. The last 496's ran on the dyno with both. I forget the gain, but the Dominator crushed teh 850 in power. and teh boat starts like it has EFI

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    gn7
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    IMO any decent Big Block needs a Dom. A well setup Dom with annulars can out low end an 850 and bury it on the top. Problem becomes, which manifold. At 5000-5500 in big boat, it really doesn't want a single plane. Why Edelbrock discontinued the Dom dual plane I will never know. Probably needed the space and line time for 409 and Buick heads



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  15. #13
    cfm
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    Quote Originally Posted by gn7 View Post
    At 5000-5500 in big boat, it really doesn't want a single plane.
    I disagree when referencing a minimum of 496cid, modern HR, and good modern heads.

    Lower cid or low lift cam or OEM heads and the dual plane is usually better in that rpm range.

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    You've got the 850 so run it. AFR 305 heads are a good choice for a mill like this. I agree with the others I would spin it to around 5800 or so, you have a solid bottom end and married to a set of AFR305s and a hyd roller you can reach your goal.
    Chris Straub
    Straub Technologies

    3HP is an A$$ Whooping!!! JW

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