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Thread: A tunnel ram for the street

  1. #1
    Member MASTER JOURNEYMAN
    Join Date
    Aug 2007
    Posts
    45

    A tunnel ram for the street

    We are debating putting a tunnel ram on a small block chevy in either a 355 or 383 configuration for our show K5 Blazer 4x4. It will be driven to shows and a cruise night every once in a while. I want to get maximum driveability out of this set up which historically has been hard to achieve because you are usually dealing with at least 900 cfm of total flow. I'd like to bring that down to about 600 to 700 cfm with out adding a single 4 barrel top, by putting the duel carb 4150 top on the intake and the adding 2 barrel adapter plates and mounting either 300 or 350 cfm demon or holley 2 barrel carbs on top. I know this will give me the air velocity for a stronger bottom end torque curve and It will be like running a single 4 barrel some what with the advantage of having the barrels mounted directly over the intake runners for better fuel charge flow. Of course it still won't behaive exactly like a single 4 barrel because instead
    of running on 2 primary barrels and then adding the secondaries as the rpm's climb. It will be running on 4 barrels opening simultaniously instead so I don't figure it will be quiet as good as a single 4 barrel but a lot better than two 4 barrels and if we put velocity stacks on these 2 barrels we can pull off the look and still get great performance. What do you guys think?

  2. #2
    Senior Member DYNO OPERATOR
    Join Date
    Jan 2004
    Location
    central Illinois
    Posts
    459

    A tunnel

    Holley makes 390 CFM vacuum secondary 4 barrels.

  3. #3
    Senior Member RACING JUNKIE
    Join Date
    Mar 2008
    Location
    falkville al
    Posts
    1,766
    ive run those 390s on a few tunnelrams on the street. never had any problems with them,just werent big enough for my engines. but i have put a few on stock motors, well a cam and headers but otherwise stock for friends and they loved them.

  4. #4
    Senior Member RACING JUNKIE
    Join Date
    Nov 2008
    Location
    Niagara Falls, NY
    Posts
    965
    my tunnel had dual 465 holleys on it and ran it in my 79 monte carlo on the street..... it ran great and had the wow factor of having 2 carbs sticking out of the hood too......
    GOOD PARTS AREN'T CHEAP AND CHEAP PARTS ARE NEVER GOOD.........
    http://img.photobucket.com/albums/v2...lastscan-3.jpg

  5. #5
    Senior Member RACING JUNKIE
    Join Date
    Mar 2006
    Location
    EUGENE,OR.
    Posts
    3,408
    Ran the typical 2/600CFM w/ Weiand tunnel on a mild SBC & it was slower... looked awesome. It was over carb/cammed. I like your thinking for aesthetic appeal though... & w/ 390 or even 450's it will be okay. You already know that you will loose low-end, but hopefully gain some high. When your foot is stuffed it, likely you will be over 3500+ anyways.... & it will look awesome on a K-5!!! send pics when done.
    "I would walk through hell on Sunday before I fear the enemy"

  6. #6
    Senior Member RACING JUNKIE lively's Avatar
    Join Date
    Nov 2004
    Location
    ILLINOIS
    Posts
    2,191
    i have had 2 and 1 carb tunnel rams on my sbf 302 and 289

    luved them both and the curb appeal is FANTASTIC :lol:

    THE DUAL UNIT WAS 600 HOLLEYS AND THE SINGLE WAS A 750 VACUUM SECONDARIES

    I RAN 4 SPEEDS AND 3:91 GEARS AND 4:88 GEARS

    go for it IT IS FUN :wink: :lol: 8)

  7. #7
    Junior Member APPRENTICE
    Join Date
    Jul 2007
    Posts
    12
    I have the perfect intake for you, an old offenhauser crossram!


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