What domi(4500 holly) is best again???
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What domi(4500 holly) is best again???

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    Senior Member H20MOFO's Avatar
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    Default What domi(4500 holly) is best again???

    I'm having a hard time finding that old thread rightytighty started, I can't remember 2 circut? 3 circut? I found a use 3 circut with soft progressive linkage, wtf does that mean??? Whatta you guys like and dislike???
    Another Hot Boat refugee

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    most all 3- circuit holleys carbs will be way rich down low and lean at wot,and you will find a ton of them for sale for this reason. if you pull the main jet out you will notice a brass tube behind it and restricts that circuit,also on the inlet side of the carb there is a middle air bleed that has a small brass tube shoved in it and it will need to be removed for better flow on that circuit but you will need to change the metering block to do this,might look at blp or aed or most of the billet blocks out there
    then if you turn the carb over and check the t-slot transfer in relation to throttle blades the should be about .020 showing on some carbs they may be showing or not and need to be adjusted by cutting the slot but it is not easy but can be done.(quality control problem at the source im am told)

    as for soft linkage my 1050 9375's open about 10 percent on primarys then open all the way at once from there.

    soooooo. two circuit all the way if you can find the older carbs are better then new ones, also i have been told to stay clear of the hp series carbs all together
    here is a link.and you can google 2 circuit conversions for more
    http://motorsportsvillage.com/forum/...php?f=6&t=3742

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    steelcomp was here
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    Three circuit carbs are for stomping on the gas and holding WOT. Part throttle drivability will suffer big time unless you make some changes. The early 6464's were notroiously rich at part throttle, but worked excellent for drag racing. The 9375 has a much cleaner intermediate since it's calibrated for 2X4 use. If you're going to be doing any cruising at all, it would be best to use a two circuit carb with power valves.
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    Senior Member H20MOFO's Avatar
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    Thanks guys.....2 circuit it is.
    Another Hot Boat refugee

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    Senior Member H20MOFO's Avatar
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    This is probably a dumb question , but those are my specialty. At a glance a std. 1050 (pn#8082) is about 709.99. A "marine" 1050 (pn#80340) is $955.95. Other than the j tubes, wtf is the difference, why would the marine one cost so much more?? Is it a better carb, or just marine approved???
    Another Hot Boat refugee

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    steelcomp was here
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    Quote Originally Posted by H20MOFO View Post
    This is probably a dumb question , but those are my specialty. At a glance a std. 1050 (pn#8082) is about 709.99. A "marine" 1050 (pn#80340) is $955.95. Other than the j tubes, wtf is the difference, why would the marine one cost so much more?? Is it a better carb, or just marine approved???
    There are other features to the carb that make it "marinized", but most of the cost is in the rating and the product liability. Unless you're running an enclosed engine compartment, it shuldn't be a concern.
    Last edited by scott foxwell; 08-23-2009 at 08:29 PM.
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    Boat Nut sleekcrafter's Avatar
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    Quote Originally Posted by H20MOFO View Post
    This is probably a dumb question , but those are my specialty. At a glance a std. 1050 (pn#8082) is about 709.99. A "marine" 1050 (pn#80340) is $955.95. Other than the j tubes, wtf is the difference, why would the marine one cost so much more?? Is it a better carb, or just marine approved???

    My marine HolleyDominator still looks new after 5 year in an enclosed engine compartment, and 4 years in an open engine compartment.
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    Resident Ford Nut Sleeper CP's Avatar
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    Quote Originally Posted by H20MOFO View Post
    This is probably a dumb question , but those are my specialty. At a glance a std. 1050 (pn#8082) is about 709.99. A "marine" 1050 (pn#80340) is $955.95. Other than the j tubes, wtf is the difference, why would the marine one cost so much more?? Is it a better carb, or just marine approved???
    If you're going to spend that much, call Patrick James of Pro Systems and ask a few questions

    http://www.prosystemsracing.com/index1.html

    Sleeper CP

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    Quote Originally Posted by H20MOFO View Post
    This is probably a dumb question , but those are my specialty. At a glance a std. 1050 (pn#8082) is about 709.99. A "marine" 1050 (pn#80340) is $955.95. Other than the j tubes, wtf is the difference, why would the marine one cost so much more?? Is it a better carb, or just marine approved???
    Holley's answer to me when I assembled Rightytighty's engine was that the marine carb was calibrated to deliver a little more fuel on low end, when you would be putting the boat on plane.

    The AED 9375 carb I replied to your PM about the other day is calibrated for a larger cubic inch engine similar to yours.

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    Senior Member H20MOFO's Avatar
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    Quote Originally Posted by obnoxious001 View Post
    Holley's answer to me when I assembled Rightytighty's engine was that the marine carb was calibrated to deliver a little more fuel on low end, when you would be putting the boat on plane.

    The AED 9375 carb I replied to your PM about the other day is calibrated for a larger cubic inch engine similar to yours.
    In the Jegs it shows that's a 3 circuit for dual carbs? I guess that doesn't matter?
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    It matters.

    Carb should be re-calibrated.

    S CP

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    gn7
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    Quote Originally Posted by H20MOFO View Post
    In the Jegs it shows that's a 3 circuit for dual carbs? I guess that doesn't matter?
    Like Steel posted earlier, the duals (9375) has 3 curcuitsand they also have annular boosters. They do this because with duals the signal to the booster is much lower. I personally like the 3 curcuit, but they do require a little tuning to get really right, specially on a single carb setup. I really like them for blower setups, because the 3rd curcuit keeps dumping fuel once activated, and it makes it much easier to jet a blower motor with them.



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    9377 or 9375 I then install full progressive linkage and change air bleeds ect with work they work really well ...and great for blowers also.

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    Some guy obnoxious001's Avatar
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    Quote Originally Posted by H20MOFO View Post
    In the Jegs it shows that's a 3 circuit for dual carbs? I guess that doesn't matter?
    Quote Originally Posted by Sleeper CP View Post
    It matters.

    Carb should be re-calibrated.

    S CP
    As I had stated in the PM,, AED built the carb originally for a single carb 565 cu in engine, should be very close to your need Kreg. I am selling it for a friend who has always had the nicest stuff, he switched over to a blower deal, and the carb has been sitting in the AED box since it came back from them rebuilding it. http://www.aedperformance.com/

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