Tunnel Ram ? - Chevelle Tech
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post #1 of 38 (permalink) Old Dec 4th, 19, 11:38 AM Thread Starter
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Tunnel Ram ?

Hello,
Anyone running a fabricated tunnel ram on 350 style Chevy, one Holley, on the street ?

If so, tell me about it
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post #2 of 38 (permalink) Old Dec 7th, 19, 2:00 PM
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Buddy, to be honest that sounds like possibly the worst street setup ever, it would take forever to warm up, it would be a bear to tune and the vacuum would would be terrible on it, but what do I know, if you really wanna do it, go ahead
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post #3 of 38 (permalink) Old Dec 7th, 19, 4:37 PM
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Re: Tunnel Ram ?

I don't have experience with fabricated intakes but I have run tunnel rams and love them. Not only cool looking but good performance. They get a bad wrap for street cars for no reason. It is no different than the long runner plastic intakes that everyone runs on factory LS and Mustangs everyday.
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post #4 of 38 (permalink) Old Dec 7th, 19, 4:44 PM
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Re: Tunnel Ram ?

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Originally Posted by 69SS454 View Post
I don't have experience with fabricated intakes but I have run tunnel rams and love them. Not only cool looking but good performance. They get a bad wrap for street cars for no reason. It is no different than the long runner plastic intakes that everyone runs on factory LS and Mustangs everyday.
There is a difference, the fuel on later model EFI engines is introduced at the base of each specific runner.

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post #5 of 38 (permalink) Old Dec 7th, 19, 4:52 PM
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Re: Tunnel Ram ?

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Originally Posted by Steve R View Post
There is a difference, the fuel on later model EFI engines is introduced at the base of each specific runner.

Steve R
We can argue differences in every example. I am just stating the fact that tunnel rams work great on the street and have for decades. Try one before you say they don't work.
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post #6 of 38 (permalink) Old Dec 7th, 19, 5:04 PM
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Re: Tunnel Ram ?

Ran a 331 in my vega with 2 4s and m22. Ran really well. Didn't seem to ever be a problem other the normal cold and no choke stuff.

RH
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post #7 of 38 (permalink) Old Dec 7th, 19, 6:22 PM
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Re: Tunnel Ram ?

A tunnel ram typically makes good power over 6K RPM but usually loses torque below that compared to dual plane manifold. Most street cars don't see 6K RPM often nor for long. For real street driving, a dual plane manifold is good but I admit lacks the cool factor of a tall tunnel ram. Can you make a tunnel ram work on the street? Sure. Will you be happy? Depends on how important torque is to you. If the car is mainly a show car, go for it! Another post mentioned low vacuum - I disagree with that. The idle and cruise vacuum will be determined by your cam not the manifold.
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post #8 of 38 (permalink) Old Dec 7th, 19, 6:30 PM Thread Starter
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69SS454,
Thanks, ever run tunnel w/single Holley ? If I took my Holley set up for common 2 plane air gap and put it on a tunnel, would you have any thoughts as to carb adjustments to make ?
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post #9 of 38 (permalink) Old Dec 7th, 19, 6:54 PM
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Re: Tunnel Ram ?

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Originally Posted by 69SS454 View Post
We can argue differences in every example. I am just stating the fact that tunnel rams work great on the street and have for decades. Try one before you say they don't work.
Iím not saying they canít be made to work, just that the example you used isnít similar. The single 4bbl the OP wants to use isnít going to help either in terms of looks or fuel distribution.

Steve R

Last edited by Steve R; Dec 7th, 19 at 6:54 PM. Reason: Z
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post #10 of 38 (permalink) Old Dec 7th, 19, 7:10 PM Thread Starter
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https://www.summitracing.com/parts/sum-226400/

This is what I’m looking at. I also prefer look of 2-4’s. Currently use 750 HP Holley DP. Can 2 small Holleys be dialed back enough to run smooth on 480HP, 383, 4:11, Muncie ?

Anyone used this intake ? Will my MSD RTR 8360 fit ?

Thanks
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post #11 of 38 (permalink) Old Dec 7th, 19, 7:24 PM
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Re: Tunnel Ram ?

A pair of 390 Holleys might work ok on a traditional tunnel ram. That intake you linked to looks like hot garbage and I suspect it works just as good as it looks.
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post #12 of 38 (permalink) Old Dec 7th, 19, 7:47 PM
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Re: Tunnel Ram ?

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Originally Posted by Tommy the Cat View Post
A pair of 390 Holleys might work ok on a traditional tunnel ram. That intake you linked to looks like hot garbage and I suspect it works just as good as it looks.
I would guess it came on the slow boat from China. Look at the outer runners, what are the odds you will get anywhere close to decent fuel distribution?

Steve R
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post #13 of 38 (permalink) Old Dec 7th, 19, 8:10 PM Thread Starter
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Thanks,
I would prefer comments from those who have actually run a tunnel ram. 👍
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post #14 of 38 (permalink) Old Dec 7th, 19, 9:47 PM
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Re: Tunnel Ram ?

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Originally Posted by Reelysalty View Post
69SS454,
Thanks, ever run tunnel w/single Holley ? If I took my Holley set up for common 2 plane air gap and put it on a tunnel, would you have any thoughts as to carb adjustments to make ?
I ran a cast single four tunnel ram on a 350 hp Ford 302 in a '54 F100. I drove it for years with a 750DP without any driving issues during hot and cold weather. I also tried a borrowed Predator carb and liked it even better. I have also run a two four tunnel on a 400 sbc in a '46 F1 and a 350 sbc in a '53 Stude pick up both with a pair of 600 cfm Holleys. There are no special carb adjustments or tricks. Those old trucks can run a tunnel ram under the hood without cutting a hole in the hood!

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post #15 of 38 (permalink) Old Dec 7th, 19, 10:04 PM Thread Starter
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69 SS454
Thanks !
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