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Old 08-19-2008, 06:45 PM
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Tunnel ram questions.........

I have a Chevelle with a stock 350 2 bbl. on and was wondering what (if anything) would have to be done to a stock motor to run a tunnel ram and 2 4bbl's. Or would I be better off swapping out the 350 for a 454 and running the tunnel ram/2-4's setup on that? Any advice??

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Old 08-19-2008, 06:49 PM
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Quote:
Originally Posted by STATUTORY GRAPE
I have a Chevelle with a stock 350 2 bbl. on and was wondering what (if anything) would have to be done to a stock motor to run a tunnel ram and 2 4bbl's. Or would I be better off swapping out the 350 for a 454 and running the tunnel ram/2-4's setup on that? Any advice??
If you had some really small 370 cfm vacuum secondary carbs you could get away with it.

It would look awesome, but not necessarily run better than a 600 on a Performer intake.
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Old 08-19-2008, 06:59 PM
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Your gonna be lookin for the smallest carbs that you find for a stock 350.
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Old 08-19-2008, 07:21 PM
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Funny you should ask:
stock 350 2bbl motor stock dished pistons (rering and bearing)
full ported small chamber #416 305 heads (1.94x 1.60" valves) To get the compression ratio and breathing up.
Thin .015" head gasket 9.5:1 cr
Isky #201027 solid lifter cam 282-282 247 247 .507 .507" 108LSA
isky 235-D valve springs
1.6-1.5 split ratio roller tip rockers
1-5/8" long tube headers dual ex.
locked out distributor timing 36deg +15deg vacuum advance
champion RV8C spark plugs 92 octane gas
two stock out of the box edelbrock 750cfm #1407 carbs
edelbrock street tunnel ram
critical:
10" 3500stall torque converter (auto trans)
4.10 or 4.56:1 gears. minimum requirments

When ya punch 'er, hang on tight... yank the handle at about 6800rpm
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Old 08-19-2008, 07:23 PM
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Tunnel ram questions.........

tunnel rams work with motors that are designed to have horse power that starts at what 1800 rpms or higher .
so you will fall on take offs from dead stop , unless you stall it at 2000 rpms .
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Old 08-19-2008, 07:23 PM
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What gears are in the rear? Auto trans with stock converter? Do you want it for show or go? What part of WI are you from? I have a 51 Chev. 350 with a Weiand tunnel ram.
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Old 08-19-2008, 07:46 PM
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I'm from LaCrosse, Eric (approx. 4 hours from you). Is the engine complete? How much are you asking for it? The rear is an open with 373 gears but I'm looking for a posi.
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Old 08-19-2008, 07:57 PM
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The 350 is in my daughters 51 Chev. Turbo 400 with 2800 stall, 411 posi, it's a 79 motor with 480/230 cam and stock heads, 500 cfm edelbrock carbs, it goes pretty good but you need to do a little planning If you want to go the tunnel ram route. It's not for sale now but just an example of what can be done.
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Old 08-19-2008, 08:25 PM
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Quote:
Originally Posted by STATUTORY GRAPE
I have a Chevelle with a stock 350 2 bbl. on and was wondering what (if anything) would have to be done to a stock motor to run a tunnel ram and 2 4bbl's. Or would I be better off swapping out the 350 for a 454 and running the tunnel ram/2-4's setup on that? Any advice??
What year, what engine?

I would say with the information given you would need to up the compression, get better heads and exhaust first thing. Tunnel rams need the ability to flow for them to be of any use.

Then comes transmission and rear gearing... tunnel rams like rpm's...
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Old 08-19-2008, 11:25 PM
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Chev. Tunnel Ram...

Quote:
Originally Posted by STATUTORY GRAPE
I have a Chevelle with a stock 350 2 bbl. on and was wondering what (if anything) would have to be done to a stock motor to run a tunnel ram and 2 4bbl's. Or would I be better off swapping out the 350 for a 454 and running the tunnel ram/2-4's setup on that? Any advice??
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Old 08-20-2008, 05:03 PM
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Quote:
Originally Posted by STATUTORY GRAPE
I have a Chevelle with a stock 350 2 bbl. on and was wondering what (if anything) would have to be done to a stock motor to run a tunnel ram and 2 4bbl's. Or would I be better off swapping out the 350 for a 454 and running the tunnel ram/2-4's setup on that? Any advice??
Ok, look here...

http://myspacetv.com/index.cfm?fusea...deoid=40914987

This is my 327 powered "Bird. I am running a Weiand tunnel ram. I went with a single 4 setup but guess how much of the entire car is stock????

If you answered with anything more than the exterior sheet metal, seats and steering wheel you're wrong...

Single 4 rams are a pain to tune due to fuel distribution issues, especially at idle; but once you get it right it will idle at a decent rpm and is managable on the street. I know a lot of people with dual setups but they usually have to make compromises along the way.

The problem with a stock setup is that airflow velocity in a stock compression / cammed engine is usually compromised to the point that you have to fudge the carb tuning in such a way that you maybe can get it to run right at either low rpm's or high rpm's... but not both at the same time.

I know there are people out there that have managed to make it work, but they are few and far between... it really comes down to simple physics.

If you're just looking for the "cool" factor and are not interested in the true potential of the ram then stick it on there and run a pair of the smallest carbs you can find... and when I say small I mean throttle bore diameter... the smaller diameter bore the higher the airflow velocity...
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Old 08-21-2008, 01:53 PM
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Statutory grape, you can run a pair of holley 390cfm #8007. change the power valve to a single stage 6.5 PV and 57 jets on the primary. Because the carbs do run a little lean. If you look at lg1969 photo album. This is what am running. 355 10:5 compression, 2.02 heads, Crane fireball cam, Holley 390 with Edlebrock street tunnel ram, turbo 350 with 3000 10" converter, and 410 gears. I can smoke the tires right off the line with no bog

Last edited by lg1969; 08-21-2008 at 02:01 PM.
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