800cfm on mild 360 ?

-
I think every one forgets that the smallest 4 barrel carb that the factory put on the 360 was an 850 cfm Thermo Quad whether it was an E58 engine or a 1 ton truck engine and the 340 got an 800 cfm TQ. Small blocks like big carbs.
 
It flowed less than 800 and being a spreadbore with small primaries, it acts like a small carb until the secondary side kicks in.
 
my 340 ran well with HOLLEY 670 , Still using it on my 426 , but it is being swapped out for a 750 or 780 holley later this week . Iwas thinking about the 850 ede as well , but pople talked me out of it for now
 
QUOTE: I think every one forgets that the smallest 4 barrel carb that the factory put on the 360 was an 850 cfm Thermo Quad
I think the earliest 340's used a 535 or 585 cfm.
600 - 650 perform nice on the street with great throttle response, clean idle and excellent mileage..if it matters.
 
This car already ran like a raped ape with the 650cfm Thunder Series carb.
I have always LOVED that term...Raped ape.
It always makes me wonder who or what would be strong and brave enough to commit this crime against an ape, then how crazed and traumatized that ape would react.
That is some funny stuff.
 
QUOTE: I think every one forgets that the smallest 4 barrel carb that the factory put on the 360 was an 850 cfm Thermo Quad
I think the earliest 340's used a 535 or 585 cfm.
600 - 650 perform nice on the street with great throttle response, clean idle and excellent mileage..if it matters.
I thought the 850 was for 400 and 440 engine while the 800 TQ was for the 318 and 360.
 
For just bolting on the 800 Ede with no tuning, in all fairness it had some good moments. Off the line, and on the top end, you could tell it liked the extra air/gas. When I get more time, and the temps cool down, I'm going to have to revisit it.
 
I agree with @moparoffical Primary metering rod springs need to be lightened a bit.
also too, the secondary air valve needs some counter weight added to it.
It is probably going a bit lean when they try to pull open. Weighting the air valve will fix that.

The AVS's have a spring loaded air valve just for that reason. In fact, the original AVS's used on the 340's and 383's had 3 step metering rods, where the AFB's did not.
 
My experience with the Ede 750’s has always been between a best of “meh” to downright “sucks”.
The 600’s have always been kinda hit or miss, depending on the combo.
I bought a new Carter 9755 right before they disappeared...... made by Weber...... looks just like the Ede.
It was actually a really good working carb.
I took it, and a 750 Ede apart right next to each other.
I didn’t dissect everything...... but the arrangement of the bleeds and tubes in the clusters were notably different between the two.
The Carter arrangement worked...... the Ede arrangement didn’t.

I put an 800 Thunder series on a 511 FAST build...... worked great.
 
My experience with the Ede 750’s has always been between a best of “meh” to downright “sucks”.
The 600’s have always been kinda hit or miss, depending on the combo.
I bought a new Carter 9755 right before they disappeared...... made by Weber...... looks just like the Ede.
It was actually a really good working carb.
I took it, and a 750 Ede apart right next to each other.
I didn’t dissect everything...... but the arrangement of the bleeds and tubes in the clusters were notably different between the two.
The Carter arrangement worked...... the Ede arrangement didn’t.

I put an 800 Thunder series on a 511 FAST build...... worked great.

That's part of the problem with the Edelbrock 750's as well as the correct Carter 750's need the correct length primary booster which is longer than the 600/625 primary booster used in the Edelbrock carb.
 
I thought the 850 was for 400 and 440 engine while the 800 TQ was for the 318 and 360.

QUOTE: I think every one forgets that the smallest 4 barrel carb that the factory put on the 360 was an 850 cfm Thermo Quad
I think the earliest 340's used a 535 or 585 cfm.
600 - 650 perform nice on the street with great throttle response, clean idle and excellent mileage..if it matters.
340’s early on used the small primary TQ. Maybe I he first year or two 360, maybe. I’d have to revisit some last homework I did.

All big blocks got the large primary TQ’s.

The earliest 330’s used a commonly rated 600 carb. I called the old Federal Mogul tech line in which they told me the small AVS around on 330’s and 383’s are a 630 cfm carb.
 
340’s early on used the small primary TQ. Maybe I he first year or two 360, maybe. I’d have to revisit some last homework I did.

All big blocks got the large primary TQ’s.

The earliest 330’s used a commonly rated 600 carb. I called the old Federal Mogul tech line in which they told me the small AVS around on 330’s and 383’s are a 630 cfm carb.

Didn't the early 340's along with 68-70 440's use a AVS. I was thinking Chrysler started using the TQ in 71.

I like to use big carbs for anything that runs hard. IIRC Don (B3422W5) went through the small/large carb deal with his 360, maybe he'll chime in.
 
Last edited:
i had a new '71 340 'Cuda (showing my age) and it came stock with a Thermoquad but i don't know the cfm.
 
I have always LOVED that term...Raped ape.
It always makes me wonder who or what would be strong and brave enough to commit this crime against an ape, then how crazed and traumatized that ape would react.
That is some funny stuff.
My favorite is " Took off like a prom dress"....
 
Last edited:
Didn't the early 340's along with 68-70 440's use a AVS. I was thinking Chrysler started using the TQ in 71.

I like to use big carbs for anything that runs hard. IIRC Don (B3422W5) went through the small/large carb deal with his 360, maybe he'll chime in.

Yep! Post34
 
Sorry guys I was wrong about the 360 with TQ, all 360 hp and standard from 74 to 78 (except vehicles with California emissions) had 1 1/2" primaries or 850 TQ ( all TQ have 2 1/4" secondaries). California emission vehicles and every thing from 78 and newer have the 1 3/8" primaries or 800 TQ, even the 400 BB. All 72 and newer 440's and (400's up to 78) had 850 TQ, 318's and 340's had 800 TQ.
There where a few different variances of the TQ the early air metered carbs, which where the 850 and 1000 cfm Competition series(1 1/2 pr.) and the 800 cfm(1 3/8 pr.) 71 340 carb. No parts from these carbs are interchangeable with the 72 and newer solid fuel metering carbs, 1 3/8 pr. 800's and 1 1/2 pr. 850's. The 340's where the only engine that got a TQ in 1971.
From 72 on all 4 barrel engines had TQ till the end of production in the 80's and then Chrysler switched to Rochester Quadrajets.
When properly tuned the ThermoQuad is most likely one of the best performance street carbs you could put on your Mopar, thats why the NHRA factored more horse power on the 71 340 than the 68 to 70 340. I think it was like(could be wrong on the exacted numbers) 300hp for the 68 to 70 340 and 325 hp for the 71 340.
 
We know back in the day the trick was to swap an original 340 AVS ( about 600cfm ) for the larger bore version about ( 750cfm ) from the 440 magnum. It was also no secret then that the 340 responded favorably to the increased carb capacity, suggesting that a larger carb would add to the HP bottom line.

Brings me to today. I have tried a 600cfm,650cfm,750cfm Eddies on my mild 360.
The 600cfm ran very well, with great response out of the hole.
The 650cfm Thunder Series has been the best out of the three, with great response, and better top end.
The 750cfm just didn't feel right. But there has been a lot of discussion about the Ede 750cfm, and its design. None favorable.

That brings me to the Ede 800cfm. I bought this carb for a 440 project that went south. I can't remember if I ever has this carb on my 360 car, or not. Not sure how it is going to run, but I guess there is only one way to find out. Stay tuned.

View attachment 1715576384

Just recently pulled my Eddie 600 and replaced it with a 770 street avenger.
Dialed it in with the A/F gauge for the mains, secondaries as well as the idle and hi speed air metering.
The thing is flawless now and pulls better than the Eddie adjusted the same.
 
In my dirt track world most guys say they run a 750 on there 362-410 engines. Funny how they always have 850's for sale at the end of the season.

I sold my 750 I had and am rebuilding an 850 DP for next year.
 
An engine will only use what it needs...you will never flow 1000cfm thru a lawnmower.
 
So just so I'm clear, you set the float height, and idle - nothing else, right? And result was it had a mid-range stumble of some sort?
 
So just so I'm clear, you set the float height, and idle - nothing else, right? And result was it had a mid-range stumble of some sort?

If that was for me, the answer is yes.
Box stock Ede 800cfm on a mild 360. Comp XE268 cam, Hi-Po 340 manifolds.
 
Ok. So then you have no idea what the actual best carb is, because you haven’t actually tuned them on your car. You bolted it on and didn’t bother fine tuning.
 
-
Back
Top