A tunnel ram for the street

Old 10-22-2011, 08:52 PM
  #1  
ogles824
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Default 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?
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Old 10-23-2011, 06:34 AM
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markdunlap
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Default A tunnel

Holley makes 390 CFM vacuum secondary 4 barrels.
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Old 10-24-2011, 03:26 AM
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outlaw256
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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.
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Old 10-24-2011, 04:24 AM
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fast75vega
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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......
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Old 10-31-2011, 04:40 PM
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Scooterz
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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.
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Old 10-31-2011, 06:46 PM
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lively
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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)
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Old 12-31-2011, 12:04 PM
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toms131
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I have the perfect intake for you, an old offenhauser crossram!
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