Carb Question.......
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Carb Question.......

  1. #1
    Member Dano214's Avatar
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    Default Carb Question.......

    Ok so i have a stock small block chevy with a edelbrock performer intake on it coupled to a volvo penta 280 drive in a 22' Schiada . The holley that im running know is one of those quadrajet replacements (4175 spreadbore) the carb is in bad shape and needs rebuilt. So heres my question, I have a Edelbrock 1406 600cfm carb that is good shape and i was going to just throw that on, but I wanted to get your guy's thoughts on the edelbrock carb for marine use. I personal like these carbs on automobile aplications but have never used them on a boat. Has anyone used them for marine aplications? What was the results, what are your thoughts good or bad?
    Thanks
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  3. #2
    Senior Member Reservoir Dog's Avatar
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    i believe that for a dual plane manifold, that carb is too small.
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  4. #3
    Or Seth, either one Budweiser's Avatar
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    They work just fine. Tuning is not as widely understood as a Holley, so good internet advice is a bit more difficult to come by. Their tuning manual is very good and easy to understand, given you have basic carburetor knowledge. The 1406 is calibrated lean for fuel economy in a car, so you will need to take a little time tuning it for your application.

    I'm pretty sure all you have to do to make it a "Marine" carburetor (for use under a hatch/enclosed engine compartment) is add the accelerator pump seal kit... You may want to look a little further into it and verify that's the case. I don't want to be responsible for blowing your family outta the boat

    The spread bore/square bore adapter plate is less than $10.

    One other thing to think about is you may need to add a fuel pressure regulator to limit fuel pressure to 6.5psi MAX... Optimum pressure is 5.5psi.

    That's all I can think of at the moment.

    Honestly, I'd just stick with the Holley. Rebuild it or have someone do it for you and keep on keeping on.
    Last edited by Budweiser; 10-23-2012 at 02:04 PM.
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  6. #4
    Member Dano214's Avatar
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    I was just thinking of a cheap way to get it back running right for now, i will eventually rebuild the holley or maybe put something else on, but im not to knowledable on that 4175 carb and not sure of anyone in my area that i would trust to rebuild it. Also i don't think the holley was a marine carb etheir? I am running a regulator and gauge so i can keep a eye on it. Budwiser- were can i get that acc pump seal? What about the vent tubes do they have to be the J style also? Also i have the rejett kit for it and have looked at the chart from edelbrock and enriched in 4 percent per there chart, figured i would start there.
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  7. #5
    Or Seth, either one Budweiser's Avatar
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    Quote Originally Posted by Dano214 View Post
    were can i get that acc pump seal? What about the vent tubes do they have to be the J style also?
    You can get the part pretty much anywere...Summit, Jegs, Auto Zone, Pep Boys, NAPA, etc. Even Amazon.com

    A quick search shows part #1471... which the description says it's for Edelbrock carburetor #'s 1409 & 1410 (marine models). Don't quote me on this, as I'm not 100% certain... But, I believe it will fit the 1406 too, it's just not a "marine" carburetor.

    One other difference between your 1406 and the 1409/10 models which is important in the case of a fuel pump diaphragm failure, is a fitting on the carburetor for the fuel pump vent. Basically a tube from the atmospheric pressure vent on the fuel pump to the throttle bore. If the fuel pump diaphragm ruptures, fuel is dumped into the engine (basically), instead of spilling raw fuel into your bilge.

    It's been a number of years since I've had an AFB/Edelbrock carburetor in front of me, but I don't recall them having vent tubes like a Holley. So, no on the J tubes... Again, If I remember correctly.

    A lot of times carb issues can be solved with a little compressed air in the various passages, after removing the bowels and metering blocks/plates.

    What performance issues are you having that lead you to believe the Holley needs a rebuild?
    Last edited by Budweiser; 10-23-2012 at 03:21 PM.
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  8. #6
    Member Dano214's Avatar
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    Thanks Budweiser for the help The current issue I was having is that its idiling a little rough but its acting more like there is a vacuum leak. I have looked at everything I can think of and can't find any leaks If i set the timing at 4 advance or even 8 it won't run, i have to run it up 12 to 14 but then it swings way to high and creates a lean condition on top end and back fires through the carb at around 3500 rpm. It runs good and smooth up to 3300 but as soon as i give it more gas it will pop through the carb. It had a edelbrock cp-2p manifold on it which are junk so I put the performer on it cause i had it laying around. Im alittle lost with this and the carb is preatty ugly looking so i figured since i changed the intake i would do the carb to. It has a brand new distributor, non vacuum mallory set up. The compression is 120psi give or take 3psi in all cylinders. I did a plug reading and all the plugs were wet except #6 was dry and golden brown. I don't know much about the internals of the motor as i have not owned the boat very long, but it's looking like a stock 350 or maybe its a 305 not sure.
    Thanks for the help.
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