Question about carbs for tunnel rams

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ozmoparjoe

ozmoparjoe

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Hello all, im after some advice about best carbs to suit a tunnel ram for the street.
So i have a 360 (manual), engine has stock bottom end with 10:1 comp, cam is a comp cams (see link)> 20-600-4 - Thumpr™ Hydraulic Flat Tappet Camshafts
heads are currently stock 360 heads but am looking at switching to alloys. Am also running a MSD dizzy, and Pacemaker headers, with 2.25 dual exhaust.
I have a TR-5 tunnel ram (see pic) that i want to use and would like to know peoples thoughts on the best suited carburettors for this type of application.
Would like to stick with Holleys.
Ps. Should i use a different top?
Thanks in advance.

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I've been using a tunnel ram on a 496 big block.Started with 2 -550 CFM Carters. Then switched to a pair of Holley 750 Dbl pumpers. Ran a little faster but not much. Actually ran .2 sec quicker with an M 1 intake and a 1050 Dominator. Best carbs are prob a pair of 660 center squirters. They are made for the tunnel ram set up. What carbs are you running? Post a better pic of the carbs, that would be helpful.
 
Garys72Duster said:
I've been using a tunnel ram on a 496 big block.Started with 2 -550 CFM Carters. Then switched to a pair of Holley 750 Dbl pumpers. Ran a little faster but not much. Actually ran .2 sec quicker with an M 1 intake and a 1050 Dominator. Best carbs are prob a pair of 660 center squirters. They are made for the tunnel ram set up. What carbs are you running? Post a better pic of the carbs, that would be helpful.
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I actually dont have carbs for it yet, the pic is from previous owner, i was told perhaps a pair of holley 390's would be ok due to my engine being only mild
 
ozmoparjoe said:
I actually dont have carbs for it yet, the pic is from previous owner, i was told perhaps a pair of holley 390's would be ok due to my engine being only mild
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2 450's should be good with compression said.
always can mess with jets.
 
Been reading up on the TR5 a little, and according to some on Moparts racing site, a SBC street tunnel ram top will bolt onto the TR5 (even though they say that Edelbrock tells them it won't) and really improve the low RPM response over the bread box plenum. The center squirters would work well, but bear in mind all four barrels open at once and there are no power valves. Great for all out performance but burn a lot of fuel. For a little more reasonable streetability, smaller vacuum secondary carbs in the 450 cfm range could be used. Most recommended carburetors by Moparts users Holley 4150 Double Pumper Carburetors 0-4776C
 
you're looking for carbs to run on the street, right? To me that means giving up some quarter mile performance to be able to drive around town or take a trip of a few hundred miles. I run an STR12 on my 340 (basically a tunnel ram folded flat to flt under the hood) and have had excellent luck with an identical pair of Edelbrock 500 cfm Performers. I know that you said you wanted to use Holleys and if so you might try a pair of 500 Holleys with vacuum secondaries. Both these carbs open the secondaries based on the demand of the engine and I think that's why this set up has been working so well for me on the street. I've been running this set up for over 7 years and 20,000 miles.

I had many tell me that I could never run this on the street, don't believe it if someone tells you the same about the tunnel ram. A few thoughts: even though there is a cross over between the plenums under the carbs, setting this up as a progressive linkage set up means the most of the time when you are driving around, you will be rich on the side under the primary carb and probably lean on the other 4 cylinders, so I would suggest you open them at the same time and have 2 identical carbs. If you use Edelbrock carbs and need a choke (don't know about weather down under) buy non-choke carbs and add the choke kit if you need it. Edelbrock meters the choke carbs to meet CA emissions standards and meters the non-choke ones for drivability. Better to eat the small extra cost and have the car run better... PLEASE LET US KNOW WHAT YOU DO AND HOW IT WORKS OUT!!!
 
Im running a tunnel ram on 496 with 2/600 holleys. Dyno 619 hp 656 torque. Befor it was rebuilt this time it had 2 600 eddies never had it dynoed but 1/4 mile times 11sec in a Volare 3600 lbs. The motor is going in a 64 dart straight axle gasser willbe ready for spring
 
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Does that big bread box style top allow you to run Carters? I have the flatter top and it is a Holley side ways only deal.

CFM wise, with your set up, a pair of 390’s for a total of 780cfm would be enough. I personally don’t know how well those carbs are up on top.
 
ozmoparjoe said:
Hello all, im after some advice about best carbs to suit a tunnel ram for the street.
So i have a 360 (manual), engine has stock bottom end with 10:1 comp, cam is a comp cams (see link)> 20-600-4 - Thumpr™ Hydraulic Flat Tappet Camshafts
heads are currently stock 360 heads but am looking at switching to alloys. Am also running a MSD dizzy, and Pacemaker headers, with 2.25 dual exhaust.
I have a TR-5 tunnel ram (see pic) that i want to use and would like to know peoples thoughts on the best suited carburettors for this type of application.
Would like to stick with Holleys.
Ps. Should i use a different top?
Thanks in advance.

View attachment 1715268265
Click to expand...


Must say i much prefer the lower top,that has a much lower rpm range and there is probably a big part of the reason why the lower top is still around on the SBC version that is still available while the bigger top is not,however its not a complete dissaster and you can run it until you find the lower top,its not like its going to blow up the engine.
Cant advice on Holley carbs for such a mild engine but i know it has been discused alot in the past and it seems as if what has been repeated a whole lot is that you should stay away from those holley mech secondary carbs that lack accpumps that are included in tunnelram kits, im a fan of the 500cfm edelbrocks for milder combinations.

Garrett Ellison said:
Been reading up on the TR5 a little, and according to some on Moparts racing site, a SBC street tunnel ram top will bolt onto the TR5 (even though they say that Edelbrock tells them it won't) and really improve the low RPM response over the bread box plenum. The center squirters would work well, but bear in mind all four barrels open at once and there are no power valves. Great for all out performance but burn a lot of fuel. For a little more reasonable streetability, smaller vacuum secondary carbs in the 450 cfm range could be used. Most recommended carburetors by Moparts users Holley 4150 Double Pumper Carburetors 0-4776C
Click to expand...
Yep the same series SBC tunnelram tops match,and will work well,much easier to find one of those than a complete mopar tunnelram with the correct top.


rumblefish360 said:
Does that big bread box style top allow you to run Carters? I have the flatter top and it is a Holley side ways only deal.

CFM wise, with your set up, a pair of 390’s for a total of 780cfm would be enough. I personally don’t know how well those carbs are up on top.
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That is intresting, The Edelbrock tunnelram with the flatter top i used to own had dual bolt paterns for straight or sideways mounted carbs so i wonder if they where machined differently from Edelbrock over the years or to match the original application(my top was from a SBC tunnelram originaly) of course it could have been drilled and threaded by the previous owner but i have a hard time seeing a racer who ran a foggersystem on a smallblock redrilling a tunnelram for Carters or Edelbrocks,funny thing was that my proform doublepumpers throttlelever didnt quite fit into the notch in the top between the carbs,it was a easy fix to run the proforms sideways but just one of those little things that was weird.
 
I ran Holley 390s for years, driven all the time, switched to Holley 600s, had more punch.
Now running FiTech, much better.
 
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I run twin 4160s. 460CFM? Each.

360Ci.
10.8-1 comp ratio

Runs great, no bog and will light the 295X65X15 slicks at will.

I was running one quick fuel 950 but it was boggy off idle. I think the small venturi on these helps off idle.
I'm set up progressive but just a little.
MPG is very bad....

I'll go into valve float before it stops pulling...

The only thing cooler than a tunnel ram is a blower!

:)
 
^^^^^always a Chevy guy giving up on the 1406 Edelbrock carburetors LOL anyways I have a 1406 on the front and a Carter performance on the back. I have another 1406 that you can only guess another Chevy friend gave up on that I'm going to match them up finally this year. I've ran them both one-to-one and Progressive over the years and found when I ran Progressive I had no lean plugs in the front and Rich plugs in the back or anything like that. That's not how carburetion works.
I've always told people for a car that's not going to be seriously raced for points or money Edelbrocks are much more user-friendly on the street and Mild performance. Personally I'd use what you have.
 
Edelbrock carbs.....

That's like having a swissarmy knife or a Benchmade.


Although as much as I enjoy shaking J pars tree. He has a well running machine.

Let's get @younggun2.0 in on this.

He may have the fastest (street) tunnel ram on the board.
 
j par said:
I've always told people for a car that's not going to be seriously raced for points or money Edelbrocks are much more user-friendly on the street and Mild performance. Personally I'd use what you have.
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So true and good advice.
If your racing for the points or money, the Holley is the most adjustable and tune able carb there is. There what you want.

The Carters are absolutely a fine carb for anything from a stock driver to some racing as they give up tune ability to the 9th degree that the Holley can have. There really is no problem going fast with the Carters. You just have to remember that there a stock carb. Edelbrock claims a slight upgrade in the circuits. So there still basically a stock carb. Unlike most Holley’s, which are a racing carb.

No matter what carb is employed, I’d keep them small. A pair of Edelbrock 500’s or Holley 390’s/450’s.
 
You know I started with this dual Quad carburetors on a stock compression 318. That's over 1200 CFM for a stock 318. I lost a half a second in the quarter mile when I put the setup on over 1 carburetor. It seems once the two primaries are open the secondaries being vacuum actuated only open up to what the motor will take.
 
Cope said:
Edelbrock carbs.....

That's like having a swissarmy knife or a Benchmade.


Although as much as I enjoy shaking J pars tree. He has a well running machine.

Let's get @younggun2.0 in on this.

He may have the fastest (street) tunnel ram on the board.
Click to expand...
I hope you notice as much as you bust my chops I don't fight back as much as I do the others. One of these Jokers would poke me like that I'd be riding him for a week LOL
 
Even the small 500 primaries are a lot of cfm to open up on a mild engine.

OZ Joe hasn’t been back since he posted this on 12/29/18. I wonder if Santa brought him a HEMI?
 
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