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I tried going down that rabbit hole many, many moons ago. Ended up using a Holley 650 DP with a manual choke.

Rob, while I haven't run the TQ on a HP manifold, I have bolted it up to a G1 Torker and RPM Air Gap using a Mr. Gasket adapter and the throttle plates all open and function. The biggest hurdle to get around is the choke linkage since it runs off a choke well on the stock manifold. Looks like...

Watched your video. Quite interesting. I wonder why there are 2X4 manifolds for just about every smallblock out there, but no LA smallblocks?

Now why didn't I think of that?

How are you measuring venturi size? Center bore?

Semantics. What sort of "dual quads"? Vacuum secondaries? Quite plausible, especially if they are flowing 500 cfm, give or take. Even the smallie 'Vettes had dual quads. A VS 2X4 setup that never opens the secondaries is probably not flowing much more than 600 cfm...ever. Even the Six Pack...

Yes, but... Both the Six Pack and TQ used vacuum operated secondaries (in the case of the TQ, the air valve was vacuum operated) So the engine doesn't flow more cfm than needed at any particular RPM range. The DP Holleys use mechanical secondaries so "over-carbing" can become a very real issue.

I like those kinda Hollies, too.

I know I'm opening a can of worms here. But I brought popcorn, so it's all good.:popcorn: Regarding carb size on a 340 build...going by the CFM formula in the old Holley Carbs by Mike Urich and Bill Fisher, my calculation come up with a CFM requirement of somewhere in the 600 cfm rating for a...

I see Summit is now offering Holley carbs in the standard zinc dichromate finish, and also now in polished aluminum, which appears to be cheaper. Any reason why the aluminum should be avoided or discouraged over the standard Holley carbs?

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Yeah, the "fake news" comment was in regard to the fact that I don't believe everything people write on the internet without verification. People say a lot of things...the dual quad low rise setup looks super cool but availability of that manifold is questionable now as well.

You are correct, sir. The air cleaner is north of 750 not including the top which is another 125. The linkage kit is also around 700. What this means is you could very easily wrap up 3000 bucks. I'm thinking 2 x 4 might be way cheaper in the long run...especially since I have a brand new Eddy...

If you look carefully, the center carb only is available and for AT only. I will be running an A-833 4 speed. I've been told the BB outboard carbs can be rejetted to work with the inboard carb but that could be "fake news".

I know this topic has been beat to death here. But let's kick the corpse down the road a little more. I keep having this recurring dream (nightmare?) of seeing my finished (340) engine topped with a six pack induction setup. Stupidly expensive costs aside, it seems every time I begin fantasizing...

Stupid question, but would an open plenum design like my early Torker work better in this situation?

So you are saying this will work then, RPM Air Gap w/ TQ, open plenum spacer with no gasket centerpiece under the baseplate...? (choke issues notwithstanding) Doesn't the divider look like it might cause some turbulence issues?

...I grabbed the old gasket to check my theory... I think I see daylight... Yep. I do see daylight... ...with no 'fudge factor' on the gasket at all. That leaves two options. 1) Run the Holley 2) Use the adapter plate and run open plenum *****OR***** Run the TQ on the cast iron stocker.

Looks like a good option. LD340 rates pretty high for flow numbers, doesn't it? Did you blend that one or is it stock?

Yeah, I'd call that a tight fit, Rob.

Wow...that's pretty close, Rob! Not much meat left there. I will try the same experiment just for snicks and grins. But just eyeballin' it tells me it's not gonna work, plus the A/G RPM has only one set of stud holes...Holley pattern. I suppose the most reasonable approach would be this...

I find this somewhat amusing, as back in the day, you were really stretching it to get 1HP per cube out of a performance street motor. The best Chrysler could do on the 340 was 275 in '68 (yes, I realize this was de-rated from a more realistic 325). IIRC, their most powerful engine was the 425HP...

I think it needs more blending, for sure.

Where did you find those numbers published, YR?

What happens if those areas are left uncovered? Does anyone know?

Perceptive you are...

Why, yes (grinning)...why do things the easy way? This way is much more...interesting. Otherwise, what would I have to talk about?

No, I s'pose not. But is anything new under the sun? An Eddy Performer is just a AFB in a new dress. An Eddy "Thunder Series" is just an AVS with new shoes. All the new Quick Fuel, Demon, etc carbs are just Holley knock-offs with a few extra farkles. All these designs are 30+ years old. The TQ...

It's possible that this thing could be ported and blended to work...? https://www.summitracing.com/parts/edl-2696/overview/ Hard to tell; it's a lousy picture.

Rob, you're in the same boat with that manifold. You would need a spacer to run a TQ.