Single carb tunnel ram
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Single carb tunnel ram

  1. #1
    OU812 Member mel87901's Avatar
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    Default Single carb tunnel ram

    Can anyone tell me what is the smallest cfm carb for single carb tunnel ram.That i can use for 455 olds mild build.Thanx

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    Senior Member SBS933's Avatar
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    Just to throw this in, I did a lot of reading before I put one on my motor ,and it seems a lot of guys were experiencing lean rear cylinders. They also had stories of blown motors, along with poor starting and idles. I decided to not install one. The verdict was run 2 carbs with a tunnel. That explains why you saw this in the 70s and not so much anymore. Just my .02

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    OU812 Member mel87901's Avatar
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    Default Tunnel ram

    This tunnel ram has been on the boat from 1976. All i have done to it is freshed it up.Someone took off when i got the boat and want to put back together the way it was,Thats all.

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    Senior Member EVILFORCE's Avatar
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    Depends on what you motor requires. You might need 750 cfm. A lot of guys will beat you up on using a single tunnel ram. I use them on older restores a lot. Biggest carb is usually in the 850 range. Motors in the 500 hp range. I think they work ok for a average runner.
    No Fool Like A Old Fool is there?

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    Senior Member DuaneHTP's Avatar
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    The single carb deal just don't work that well on a tunnel ram. That being said; The smaller one you run, the better off it will work. Probably nothing over a good mechanical 750 cfm. would be a good choice.

    Duane HTP
    Last edited by DuaneHTP; 08-26-2012 at 03:14 PM.

  8. #6
    BTC cardcarrying member sunkisst's Avatar
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    Default Single 4 tunnel ram..

    I ran an 1150 Dominator on this manifold as an experiment compared to a Dart Dominator single plane single 4 intake. The thing ran ok but I couldnt get it to idle as well as the Dart intake. I was interested in drivability so I ditched the idea.

  9. #7
    Senior Member ontheNOS's Avatar
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    Default hmmmm

    Put the single plane intake back on it and throw that tunnel ram in the trash.
    I actually tested rams vs single plane manifolds and truthfully found the super victor being a out of the box nice piece.

  10. #8
    OU812 Member mel87901's Avatar
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    Default Tunnel Ram

    The boat run pretty good before for a family play boat.

  11. #9
    Senior Member PCE680's Avatar
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    Quote Originally Posted by DuaneHTP View Post
    The single carb deal just don't work that well on a tunnel ram. That being said; The smaller one you run, the better off it will work. Probably nothing over a good mechanical 750 cfm. would be a good choice.

    Duane HTP
    REALLY
    WHY does Dave Hughes build this ?


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  12. #10
    Senior Member EVILFORCE's Avatar
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    Quote Originally Posted by mel87901 View Post
    The boat run pretty good before for a family play boat.
    Yes they run good. If you are wanting max performance then no. Use something else. If you like it use it. People around here will have you buying a Blown-Turbo-intercooled-Fuel injected-NOS injected-water injected motor for your fun boat.
    Last edited by EVILFORCE; 08-26-2012 at 05:07 PM.
    No Fool Like A Old Fool is there?

  13. #11
    OU812 Member mel87901's Avatar
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    Default Tunnel Ram

    Well said.

  14. #12
    The Good mrjoshua's Avatar
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    Whatever you do Mel I hope it runs great for you. I would love to get my ass kicked by my old boat! Can't wait to see it back on the water.

  15. #13
    OU812 Member mel87901's Avatar
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    Default tunnel ram

    Soon very soon.Thanx needing that scoop of yours

  16. #14
    Senior Member DuaneHTP's Avatar
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    REALLY
    WHY does Dave Hughes build this ?

    Because it works. It's not a traditional tunnel ram, its a sheet metal intake with a special built open plenium. I was talking about a cast type with a cast top. I didn't realize this is what we were talking about here. Yeah, go ahead and use it!
    Duane HTP
    Last edited by DuaneHTP; 08-27-2012 at 06:07 PM.

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