Carb HELP...! Pleaseeeeeee...!
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Carb HELP...! Pleaseeeeeee...!

  1. #1
    Member Get'erWet's Avatar
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    Default Carb HELP...! Pleaseeeeeee...!

    OK...so I'm new here and not sure if this has gone around or not yet...?
    Just purchased a 21' Rochelle Craft with a 454, previous owner added a Edlebrock #1411 750 with .110 jets and elec. Choke (not hooked up).
    It sputters a bit after sitting idle or crusing slow then getting on it.
    I have a New in Box Edlebrock #1407 750 with .113 jets and manual choke, it was originally purchased for a Stout 340 Street runner.
    Which would be better for this Ol' Chevy.....?
    I have to admit...I'm not a Chevy guy and my Dad would jump out of his grave if he new I had one...SERIOUS...Sorry Dad, Love and miss you.

    Any advice would most greatly be appreciated....Thanks,

    Diamond Dave

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  3. #2
    JRPM/e-PerformanceMarine Squirtin Thunder's Avatar
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    It will work, I run one, but the Holley version will net more power.
    Jim & Amanda Rich
    CJ 72 & 53c

    JR Performance Motorsports

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    Member Get'erWet's Avatar
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    Thx Thunder....that's what I'm looking for is POWER and Economy....hehe
    I do have the original Holly that came with the engine...don't know anything about it but surely it will require a rebuild, it's been off the engine for about two years I think the previous owner said...been a long time since i've done of this kind of work.


    Diamond Dave

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  6. #4
    Cas
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    here's the Edelbrock owner's manual-
    http://www.edelbrock.com/automotive_...ers_manual.pdf

    On page 9 you will find the specs and then on pg 13, you will find a reference chart for the 1407. It's a really good tool for tuning the Edelbrocks to your specs.

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    Member Get'erWet's Avatar
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    Cas...thx...very helpful...now to get busy to see how easy this will be for me to screw it up...hehe
    No Serious....!


    Diamond Dave

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    theres a formula out ther fer figuring how much carb cfm/size you need...a..summmit web site maybe. cubes x rpms divided by sumpin...probly too much carb,more carb doesnt always mean more power.what do the plugs look like.black i bet(too much gas).cam specs will also help determine what carb you need .i put a 750 eddie ona mild build 460 and it ran like crap,switched to a MARINE 600 eddie and whamo seamless operation from idle to wot.that being said the formula has always sugested a smaller carb than i thought it would.heres the curve ball,i did the formula for my 532 at 6000 rpm and it came out to somewhere around 950 cfm yet i run two 750 double pumpers and they run great through out the rpm range. i dont know why but they do.[/IMG]

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    Senior Member DuaneHTP's Avatar
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    Because Jet Boats like a LOT MORE carburetion than is shown on those car carburetor charts. A good rule of thumb for a jet boat is; [1.6 x what the car charts show = good performance].
    Duane HTP

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