Holley Marine vs. Street/race
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Holley Marine vs. Street/race

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    Member ry-guy's Avatar
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    Default Holley Marine vs. Street/race

    Could anyone explain the difference between the marine and stree/race Holleys. All I can find is that there is metering plate difference, and J vent tubes. Can I convert a street 750DP to work well and safely on my mild 454, jet? ry-guy
    84 Eliminator Sport, 454, Berk JG

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    Senior Member Schiada 201's Avatar
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    Yes you can, some use different power valve and jets, however you can change them to suit your setup.

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    shaft seals are different as well.

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    Member ry-guy's Avatar
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    I was thinking of running a 750 DP VS that I had on the shelf. Just putting a set of J tubes in and see how it runs this spring. I had it on a P/U with a mild 402 BITD. ry-guy
    84 Eliminator Sport, 454, Berk JG

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    Senior Member carreradude's Avatar
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    Quote Originally Posted by ry-guy View Post
    I was thinking of running a 750 DP VS that I had on the shelf. Just putting a set of J tubes in and see how it runs this spring. I had it on a P/U with a mild 402 BITD. ry-guy


    No such thing as a 750 DP VS. It is one or the other.

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    S&S
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    Is your motor covered? IF NOT, there are many that don't even bother switching out the vent tubes. Unless you boat somewhere the rangers will be looking for it. I've ran many "car" carbs on boats with no j-tubes and never had an issue. All have been on motors that are out in open air, where you can spot a problem before it becomes a big deal.

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    Member ry-guy's Avatar
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    Quote Originally Posted by carreradude View Post
    No such thing as a 750 DP VS. It is one or the other.
    my bad just a 750 VS dual feed
    84 Eliminator Sport, 454, Berk JG

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    Member ry-guy's Avatar
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    Quote Originally Posted by S&S View Post
    Is your motor covered? IF NOT, there are many that don't even bother switching out the vent tubes. Unless you boat somewhere the rangers will be looking for it. I've ran many "car" carbs on boats with no j-tubes and never had an issue. All have been on motors that are out in open air, where you can spot a problem before it becomes a big deal.
    Yes the motor is covered, just tryin to think safety, so J-tubes and flame arrestor.
    84 Eliminator Sport, 454, Berk JG

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    Senior Member rpm0414's Avatar
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    My motor is covered. And I have marine 750 vs and it doesn't have j tubes. It has fuel bowl safety dump tube in Venturi. So without the J tubes still hard for someone at a glance to say its not marine "approved" . The flame arrestor still good idea no matter what. K and N make good one.
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    Junior Member azjetfan's Avatar
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    Default Kti to convert to J Vent tubes?

    I think I have the 850DP (markings:5533B P32 2A). Is it necessary to convert the vent tubes to J-type? Is there a conversion kit? Motor is BB Chevy.

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    I run rubber hose extension on mine about 4'' tall and wire tie the to the air cleaner stud mount, never had one come off good idea for waves and hard turns.

    Open engine flat here.
    Last edited by havasubyou; 06-02-2012 at 10:20 AM.

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    Senior Member md-11mike's Avatar
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    You are flirting with things that go boom if you are running this in an enclosed
    engine compartment. Sure a lot of you haven't had a problem but obviously it is a problem or it wouldn't be a requirement. Do you have a shielded distributor or a shielded alternator? All you need is a spark and fumes and at best you will just lose you engine cover.

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    gn7
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    Quote Originally Posted by rpm0414 View Post
    My motor is covered. And I have marine 750 vs and it doesn't have j tubes. It has fuel bowl safety dump tube in Venturi. So without the J tubes still hard for someone at a glance to say its not marine "approved" . The flame arrestor still good idea no matter what. K and N make good one.
    I'm sorry. I have heard this before and I am not buying it. Never heard of a "venturi" dump tube. Love to see what it looks like and how it ties in with the float bowl.
    Your carb has no I.D. numbers because the choke horn has been milled off. Did you buy this carb new and know what the Holley list number is, or are you "taking the word" of somebody that told you it is a marine carb? Have you called Holley about this carb. Do you have a list number for this RARE piece?
    Personally, I have never seen a Holley marine carb that didn't have J tubes, and I know of nobody that has.
    If you have no first hand proof that is in fact an APPROVED USCG carb, and you run it in enclosed engine compartment you may be playing with fire. Literally!

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    Last edited by gn7; 06-02-2012 at 10:02 PM.

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    Quote Originally Posted by md-11mike View Post
    You are flirting with things that go boom if you are running this in an enclosed
    engine compartment. Sure a lot of you haven't had a problem but obviously it is a problem or it wouldn't be a requirement. Do you have a shielded distributor or a shielded alternator? All you need is a spark and fumes and at best you will just lose you engine cover.
    Don't forget the starter. A spark is a spark regardless of where it comes from, and ANY fuel vapor is a potential BOMB.... Use the bilge blowers every time or have everyone aboard wear a flame suit...

    Ray
    LOUD BOATS SAVE LIVES

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