Who makes a 340/360 thermoquad style aluminum intake

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khaley71

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I want to swap my cast iron 1971 340 thermoquad style intake for an aluminum intake. Most of the ones I've looked at have provisions for an egr or other emissions. Anyone know if there is an aluminum intake similar to stock intake without the egr provision?
 
Mopar performance M-1 has thermoquad base pattern. It is a Single plane though. Also holley had a strip dominator but it is out of production now. Can be found on ebay from time to time. Or you can get a adapter from Mr Gasket or I believe transdapt has it. :)
 
Edelbrock Performer (not RPM) mounts square or spread-bore carbs and there are versions with or without EGR...
 
They make block-off plates for the EGR.

Everybody used to make spread-bore dual-planes. But the factory intake works very,very,well. I wouldn't swap it out just to save a few pounds.And I can't say you will be happier with any aluminum intake on a factory engine. That 71 C.I. intake is a gem.

But if you have your heart set on an aluminum intake, I checked the PAW catalog, and found examples from Edelbrock,Holley,Wiand, Offenhauser, and MaMopar; some with,some without, EGR.
 
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Weiand 8007 has the thermoquad bolt pattern...at least the one I have does...older version
 
Everybody made one at some point in time. The Holley Street Dominator is a very good one, although the EGR will need to be blocked off.

As said though, it is difficult to beat the stock 71 iron intake on a mild engine.
 
Weiand Action Plus fits both TQ and square bores. Outside of weight, there is really no performance gain over the factory cast
 
if you did decide to stick with the oem intake, you can port match the intake /heads/ gaskets. It's not huge, but it helps.
I'm partial to TQ's, so I find it encouraging to see someone else is still using them. I think Edelbrock has started producing their own version of the TQ, but they did away with some of the best features IMHO.
 
Wieand 8007 that I have has a TQ pattern and no egr.

Also had a flat spot on the heat crossover to bolt a bimetallic mechanical choke pull.
 
if you did decide to stick with the oem intake, you can port match the intake /heads/ gaskets. It's not huge, but it helps.
I'm partial to TQ's, so I find it encouraging to see someone else is still using them. I think Edelbrock has started producing their own version of the TQ, but they did away with some of the best features IMHO.

I have always been partial to TQ's. The heads on my motor have had some work done to them. I would call it more of a "clean up" than porting. I have a Demon which looks kind of similar to a TQ. It's a good carb, just not the right one for this motor. On a side note as stated I am partial to the TQ's... so much so that I had a Chevelle years ago and when I popped the hood the GM crowd would be mortified to see a TQ where a quadrajet should be. That quadrajet was one of the worst carbs I ever had to deal with.
 
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I want to thank everyone for their help with my intake question. I had two main goals...weight reduction and keeping it as "stock appearing" as possible, performance was second. The aluminum intake would have had any obvious markings removed and been painted the factory color. After reading everyones post I decided to stick with my OE intake. It doesn't seem worth the trouble to swap it out with little to no gain. I didn't realize the 71 intake was such a good unit for a mild motor. Thanks again everyone this really is a great forum.
 
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Edelbrock LD340 was machined for a square bore but the casting is spreadbore shape and can be opened up to mount a TQ.
 
Yes i think i have seen someone do that. It really is not too hard to sculpt opening for thermoquad pattern! There seems to be plenty of meat.:rolleyes:
 
Now you have more to spend on more stock stuff. Check out
RustyRatRod's Guide To Hot Rod Bliss
I still say this should be made into a sticky.

Hard to disagree with that thread. The first performance gains are relatively cheap, the further you go, the more expensive it gets as well as temperamental.

There is a happy medium.

I needed a four barrel manifold, I could of bought a stock cast iron dual plane for a little cheaper than the aluminum dual plane manifold I ended up with. Probably could of saved $25?

One thing that is not up for debate is weight.
Add weight and it takes more power to move it, it takes more effort to stop it and it takes more grip to go around the corner.

Does the aluminum intake make more power? Probably not. Between the aluminum intake and headers it lost 25lbs off the front of the car, that is significant.

Power to weight, it doesn't matter if it gained any hp, it lost weight, which equals a performance gain. And the weight came off the heavy end of the car.

If I were bored and didn't have anything that "needed" to be done, I would switch to the aluminum manifold just to reduce weight, and because I had nothing better to do with my time and money.

It is a hobby after all.

Edited to add: headers and intake are some of the cheapest weight reductions you can buy.

 
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