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Old 07-20-2010, 05:13 PM
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406 with tunnel ram or single carb with intake

Fellows, forgive me if you have covered it. If so, could not find it. I'm having a 406 built for a street motor. I know a guy who has a weiand tunnel ram with 2 450 holleys that are brand new. Would I make more power with that setup over say a 750 with a single plane intake. It will be a hydralic cam. It will be build for pumped gas, 9.5 to 10 to 0 compression. It would look cool to. Thanks Lee

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Old 07-20-2010, 05:23 PM
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Would you have to pay for it before trying it...or would he let you "sample" it? I'd sample it if I had the opportunity.
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Old 07-20-2010, 05:33 PM
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The tunnel ram will make more power than any single 4 bbl carb manifold.

The 450cfm carb will hold that advantage back thou.
Tunnel rams need to breath deep. The normal carb size rules don;t apply if real power is what you want.
Think two 650 to 750carbs for power.

But smaller carbs are easier to tune for low rpm street duty.

If your cam is small duration and you don't have a high stall and stiff gearing you are not going to realize the power a tunnel ram can make even on the street.

Think 10:1 compression
240@.050" + cam

3500 stall converter+
Lots of gear 4.10 ++.

650 or 750 cfm carbs.

The tunnel ram will drive very well when set up correctly on the street.
You must allow the manifold runners and carbs to fully warm up for street driving. Until the thing warms up they are a bit bocky.
Functional manually operated carb chokes help a lot.

What cam gears converter do you have?
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Old 07-20-2010, 05:36 PM
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The guy who has the tunnel ram built an engine before for me. This 406 would be the second. He knows how to tune the the ram. But wouldn't you have to build the engine somwhat based on the intake and carb? He would let me try it first.
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Old 07-20-2010, 05:40 PM
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Try it. If it doesn't work out, you could always go to a single carb/intake. At least you'll know how it would do...instead of wondering about the possibilities, later.
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Old 07-20-2010, 05:44 PM
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Its in a 84 chevy truck. 3;73 limited slip, 2300 350 turbo. I have a comp x274 cam from my first 355, but thought about going bigger.
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Old 07-20-2010, 05:44 PM
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Quote:
Originally Posted by Bracewell
The guy who has the tunnel ram built an engine before for me. This 406 would be the second. He knows how to tune the the ram. But wouldn't you have to build the engine somwhat based on the intake and carb? He would let me try it first.
Yes, to realize the power advantage a tunnel ram will make over a single 4bbl manifold, the rest of the combination has to work with it.

People use the small carbs on the street cause they are easy to tune and drive at low rpm on mild near stock motors with a tunnel ram
.
Basically for show.

The bigger the heads, cam, carbs , headers and the more rpm, the better the tunnel ram works. Not a good choice for a truck.

if you have no gear, no converter, no cam, no cylinder head port flow no rpm you will not see the power.
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Old 07-20-2010, 05:47 PM
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I'm trying to use as much as i can from my 355. I have vortec heads with a performer rpm intake.
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Old 07-20-2010, 05:50 PM
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Quote:
Originally Posted by Bracewell
Its in a 84 chevy truck. 3;73 limited slip, 2300 350 turbo. I have a comp x274 cam from my first 355, but thought about going bigger.
You are not even close.
it's all wrong for a tunnel ram

Get the new edelbrock rpm dual plane dual quad hi rise manifold.

If the truck has tall tires you will need very very steep gearing.

3500-4000 stall.

The xe274 is not big enough either.

with this combo you will not see more than 10 peak hp gain over a 4bbl.
|. This is not a good choice for a truck with a mild motor.
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Old 07-20-2010, 05:53 PM
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Thanks for the advice. I thought about getting my vortec heads ported along with a ported victor single plane intake since i already had the heads. again, thanks for the advice. Lee
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Old 07-20-2010, 06:07 PM
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Quote:
Originally Posted by Bracewell
Thanks for the advice. I thought about getting my vortec heads ported along with a ported victor single plane intake since i already had the heads. again, thanks for the advice. Lee
A single plane manifold is a really bad choice for your mild truck.
it does not work with a 2300 stall or 3.73's or a mild cam.

Stock with the performer RPM dual plane.

Even with what you got now
you need a 3500 stall and 4.56's to get that truck going.
Trucks are heavy.

A tunnel ramed 406 in a truck would need a 248-258 deg solid lifter .530-.550 cam,
3500-4500 stall 4.56 to 5.38 gears and two 650-750cfm carbs.
The taller the tires the steeper the gears required.

Think 3500 rpm to 6800 rpm with a street tunnel ram.

There is no bolt on tunnel ram for vortec heads.

But there is a cool dual quad dual plane Performer RPM manifold for the vortec heads. But again needs the right cam, gear and converter.
Works good with the 500cfm edelbrock carbs. can use up to the 650cfm carbs. These dual quad manifolds seem to like carb spacers too.

http://www.alteredwheelbasenova.com/
http://www.youtube.com/watch?v=M61ZP...eature=related

You could build a very similar motor with the 406 and vortec heads.
comp street mechanical roller cam and dual quads.

again lots of gear, and a loose high stall converter for the truck.
Its going to want to rev.
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Old 07-21-2010, 09:35 AM
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One 750 Holley on a Tunnel Ram. I would not bother with the setup. Fuel distribution will be poor at part throttle. Low end response is not as good. Putting 750DP in a
heavy truck. Hope you do not bog when hit the pedal. 750VS is better choice.
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Old 10-12-2010, 01:12 PM
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hey i have done alot of reading on the tunnel rams recently and like was said before the 450 carbs he has are one of the recommended carbs for the tunnel ram although without a good set of heads and a sick cam you will not see the benifits of the tunnel ram i think if i had to setup yout truck now you will definatly need taller gears 4.10 at least that should keep you on the expressway for short periods without running it out
next definatly splurge on a set of heads that flow some serious cfm and match them up with a set of headers and nonrestrictive exhaust and a 3000 stall converter keep you from scaring the children at every stop light thats still a decent setup but you will be able to drive it to work every day and you can get away with using the 450 carbs but i would have to recommend the 660 center squirter carbs that are also made for t ram intakes and you will be right in the grey area of streetability but i dont think you will get punked at a stoplight lol

i am currently running a 355 with 11.5-1 comp a big lift solid cam aluminum heads headers freeflowing exhaust a tunnel ram and two 770 cfm carbeurators and i will be looking for about 550 hp but serious power well past 5000 rpm which is why you need some tall *** gears
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