Why Do Edelbrock 750s Have Different Boosters?

[@duanedahl8856]

As a 528 Chrysler hemi owner, i see many guys run these carbs similar to OE fashion, with a electric choke model in the rear, and a manual model on the front. This seems counter intuitive...i bought 2 manual carbs for my 528...seems proper.

[@MuscleCarSolutions]

The rear carb on an Edelbrock two four set up is always electric choke on a street set up and is considered the primary carb.

[@trifivegarage8683]

Interesting...thanks for sharing! 👍With your help the 1406 in My 56 does everything I need it too! 👍 Thank you.

[@MuscleCarSolutions]

Glad to hear that. Good work!

[@VinoRatRodbuilds]

Manual over electric choke that's new 2 me about performance. 👍

[@MuscleCarSolutions]

It’s still a confusing topic. I suppose I might try to squeeze in an on engine comparison in a future video, but I’m not sure even that would satisfy folks. Back to the drawing board! 😀

[@khanmac9223]

Great content, as always.

[@MuscleCarSolutions]

Thanks!

[@moparnut6286]

Excellent resource as always.

[@MuscleCarSolutions]

Thanks man! Too much confusion out there. It deserved to be cleared up!

[@pacbrian3809]

this is the kind of stuff that i want to see and no one else shows thanx man

[@johnweaver8470]

This video has me wondering if swapping out my 1407 to the 1411 would get a few more miles to the gallon on my 454 square body,?

[@MuscleCarSolutions]

If you’re looking for leaps that big in fuel economy, you’ll find that in the transmission.

[@jesseduke694]

I ran a tuned 1411 on my old ford 390 in my pickup with 4.11 gears & was getting 7.9 mpg running around the country side. I switch to a 1405 & my fuel milage went up to 8.8 mpg running around the country side & performance is almost the same. I might have slightly less with 1405? It's so slight I'm not even sure it's really different? I have not tuned the 1405 yet. Just thought I'd share since I read you were talking fuel milage. From one big block guy to another.

[@christopherpoucher483]

I noticed on my 1407 secondary boosters have a small brass plug instead of a tiny orifice on the side of each one. Is this normal? All my others 1406 and 1405 have the holes

[@1966-Charger]

Manual always for performance.

[@MuscleCarSolutions]

Now you know why!

[@1966-Charger]

@@MuscleCarSolutions YEP!

[@t5091md]

How about the secondary boosters?

[@MuscleCarSolutions]

We covered that in the video….

[@brandonstewart7145]

I have a 1411 carburetor and what I'm wondering is can I switch to the primary booster for a 1407 or do I need to get a 1407 carburetor? I did have a 1407 carburetor, but I get rid of it to get the electric choke version.

[@MuscleCarSolutions]

Yes you can put your 1407 boosters in the 1411 carburetor.

[@brandonstewart7145]

Thank you for the response, do you know if Edelbrock sells those boosters or anywhere else?

[@MuscleCarSolutions]

@@brandonstewart7145 no. Boosters are not sold separately.

[@brandonstewart7145]

@@MuscleCarSolutions those bastards Lol, guess I will have to buy a different carb. Thank you for the video they are always helpful!!!

[@jesseduke694]

I have both of these carburetors. Ive found my 1411 seems to run better on my 390. I do use it for performance. I have bought the tuning kit. But it wasnt far off as is. A rod change & the step up springs changed. Stock jets and it seems to run very good. My 1407 seems to want to run rich. I have not bought a tuning kit for the 1407. But recently i acquired a 1405 600 cfm carb & i put a rebuild kit in it & i have ordered a tuning kit for it but they are on back order. But the 1405 stock on my 390 runs pretty good. I might have a small bit of performance loss but it is small if any. But checking my fuel milage in my old pickup with 4.11 gears just running around the country side with the 1411 i was getting 7.9 mpg but with the 1405 im getting 8.8 mpg. So almost a full mile per gallon better. Over the road with the 1411 i got 10.2 mpg. I have not gone over the road with the 1405 yet.

[@timleonard86]

So are the bodies the same?

[@MuscleCarSolutions]

Yes.

[@timleonard86]

Wonder why no 3rd party hasn't just produced billet boosters if that be the cfm difference

[@MuscleCarSolutions]

@@timleonard86 they’d never recover the cost of development without charging a ridiculous amount. And really who would buy them?

[@yurimodin7333]

Has anyone actually got an answer from Edelbrock on this?........just my guess but the 'economy' models are probobly designed to cope with a really strong signal(especially at idle like you would get from an OEM cam). That said I still plan on running my 1406 on my hotter street engine with proper tuning etc. Also my Lincoln 460 is running awesome with that 500AVS1 I got from you 💪

[@MuscleCarSolutions]

I’m not sure how much more clearer I can make it. Their catalog states it. The separate part numbers and the physical measurements confirm it. The electric choke carburetors are calibrated with economy in mind. The manual choke carbs (as they list them) are calibrated for performance. As I mentioned in the video, yes you can still tune the electric choke carburetors, but if performance is the primary factor in a build, the manual chokes are always going to deliver more fuel.

[@yurimodin7333]

@@MuscleCarSolutions Sorry, I guess I am dense sometimes. I meant more for clarification/academic deeper dive from their engineers on what they were trying to do and why more from pure curiosity. Plus if you are permanently knee-capped one way or the other. Also if I am curious if by their definition of 'performance' they are meaning full racer.

[@MuscleCarSolutions]

@@yurimodin7333 street performance. And I’ve made mention of that a few times. It’s a universal carburetor and a ton of those get sold in chain stores that are replacements for typically expensive factory carburetors. As far as being limited, take a peek at the tuning charts I referenced in the video. Or you can compare the 600s. There will be a tipping point if you’re trying to go richer past what the chart has where you’re run out of options. Now you can always ignore it and use the tuning chart from the manual choke carb if you have the electric choke carb, but if the boosters won’t flow it….it’s not really going to matter. If economy with a little performance is your preference, the electric choke carbs will work. If you’re only concerned with the performance side, choose the manual choke with the higher flowing booster and you’ll have the ability to tune for that.

[@Bbbbad724]

The Holley 3310. The 750 and the downleg 780 are really easy to tune. Put a vacuum gauge and an oxygen sensor with a meter, you can tune the carb to deliver acceptable mileage but a Holley is a performance carburetor. Great ion anything.

[@MuscleCarSolutions]

The 3310 is a street carburetor and irrelevant to this video.

[@Bbbbad724]

@@MuscleCarSolutions Why would it not be? Edelbrocks are not race carbs,There many 3310s bracket and NHRA stock. The 375 hp 396 has to run one in C class.

[@MuscleCarSolutions]

@@Bbbbad724 what does some random comment about a different brand of carburetor have to do with this video? I’ve got Holley videos if you’d like to check those out. Maybe leave another random comment on one of those!

[@Bbbbad724]

@@MuscleCarSolutions Es

[@tkracing5875]

😂some people!! This guy is something else