What carb should I use?
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Cross-Country
Joined: Sep 2024
Posts: 78
Likes: 3
What carb should I use?
Hey, so I have a 76 460 that I’m putting together, it pretty much bone stock except for a cam from an RV to help with the bottom end. I have the stock carb but I was looking at some other ones and I came across a 750 cfm Holly carb and a couple 670 cfm hollys, is it worth it to but a 750 on? Will it improve performance by a noticeable amount? And will I need an adapter plate?
Hotshot
Joined: Feb 2004
Posts: 10,808
Likes: 2,604
From: The Shenandoah Valley
All else being equal, I doubt you'd see any difference 670 cfm vs 750 cfm. A 750 might have an edge at top end. The biggest reason to go to a Holley is it's "tuanability" in my view, and in a truck I'd stick to vacuum secondaries.
Don't know what intake you are using, stock or aftermarket.
Don't know what intake you are using, stock or aftermarket.
Lead Driver
Joined: Oct 2018
Posts: 7,877
Likes: 2,365
A 670 is fine, 750 will work too. Holley would tell you a 600 is adequate and they're right.
Fords are normally square bore, but I have seen 460's that are spread bore. you'll have to look I'm not sure what years are what. Holley makes spread bores also. ditch your EGR plate if you don't need it for emissions.
I personally don't care for any of the cartoon Holley series, Holley experts have told me this and I've found it to be true. if you want the best stay with a 4160 single feed electric choke. you'll love it.
Fords are normally square bore, but I have seen 460's that are spread bore. you'll have to look I'm not sure what years are what. Holley makes spread bores also. ditch your EGR plate if you don't need it for emissions.
I personally don't care for any of the cartoon Holley series, Holley experts have told me this and I've found it to be true. if you want the best stay with a 4160 single feed electric choke. you'll love it.
Fleet Mechanic
Joined: Mar 2013
Posts: 1,661
Likes: 1,062
From: Montana
I agree, 600 would be sufficient for a stock build in a truck, even on a 460.
I have tried the an avenger series carb in the past when they first came out. I had nothing but problems with it. I have heard they have improved since then, but I won't be using one again. Their standard 4160 will work just fine.
There are adapter plates to mate a square bore carb to spread bore intake or vice versa. I've used them before to replace worn out quadrajets that were spread bore with a square bore carb.
I have tried the an avenger series carb in the past when they first came out. I had nothing but problems with it. I have heard they have improved since then, but I won't be using one again. Their standard 4160 will work just fine.
There are adapter plates to mate a square bore carb to spread bore intake or vice versa. I've used them before to replace worn out quadrajets that were spread bore with a square bore carb.
Fleet Mechanic
Joined: Feb 2004
Posts: 1,508
Likes: 332
From: Arlington,Wa
My Edelbrock 750 is doing great. Set the mixture and idle speed and it's all good. No problems.
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Cross-Country
Joined: Sep 2024
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Ok thanks for everyone replying, I think I’ll go with the 750. From what I’ve seen as long as I tune it right I should be good
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Tuned
Joined: Feb 2020
Posts: 469
Likes: 245
From: South Central Mo
If going with a Holley, be sure to look at the factory refurbished part of their website (if buying directly from Holley).
I got a regular 600 cfm 4160 for about half price & a 500 cfm 4412 for less than half price that way. Made up for the obscene about they wanted for a 670 cfm off-road Avenger I bought & still haven't used. Got some MSD 6al boxes that way as well for about half price.
I got a regular 600 cfm 4160 for about half price & a 500 cfm 4412 for less than half price that way. Made up for the obscene about they wanted for a 670 cfm off-road Avenger I bought & still haven't used. Got some MSD 6al boxes that way as well for about half price.
Laughing Gas
Joined: May 2021
Posts: 1,163
Likes: 360
From: Anderson, California
@Kashdon
I hope your pockets are full of Kash (cash). LoL
Hey, so I will share my 429 / holley 750cfm 3310s experience.
For my '78 Ford E250 4x4 Trekker-Van with an engine block casting D7TE (429), below is what I opted for.
I kept the 4300 motorcraft 4-bbl for smogging, and for performance, went with the alum Edelbrock intake and the Holley 750 man choke which is a 3310s. Can't remember the List number.
I haven't yet figured out the Difference between a 4150 and a 4160.
The 750 even works very well while out Cow-Trailing in 4x4 Low.
I'm liking the suggestion of purchasing a Holley "RE-FURBISHED" carb directly from Holley.
I hope your pockets are full of Kash (cash). LoL
Hey, so I will share my 429 / holley 750cfm 3310s experience.
For my '78 Ford E250 4x4 Trekker-Van with an engine block casting D7TE (429), below is what I opted for.
I kept the 4300 motorcraft 4-bbl for smogging, and for performance, went with the alum Edelbrock intake and the Holley 750 man choke which is a 3310s. Can't remember the List number.
I haven't yet figured out the Difference between a 4150 and a 4160.
The 750 even works very well while out Cow-Trailing in 4x4 Low.
I'm liking the suggestion of purchasing a Holley "RE-FURBISHED" carb directly from Holley.
Fleet Mechanic
Joined: Mar 2013
Posts: 1,661
Likes: 1,062
From: Montana
@Kashdon
I hope your pockets are full of Kash (cash). LoL
Hey, so I will share my 429 / holley 750cfm 3310s experience.
For my '78 Ford E250 4x4 Trekker-Van with an engine block casting D7TE (429), below is what I opted for.
I kept the 4300 motorcraft 4-bbl for smogging, and for performance, went with the alum Edelbrock intake and the Holley 750 man choke which is a 3310s. Can't remember the List number.
I haven't yet figured out the Difference between a 4150 and a 4160.
The 750 even works very well while out Cow-Trailing in 4x4 Low.
I'm liking the suggestion of purchasing a Holley "RE-FURBISHED" carb directly from Holley.
I hope your pockets are full of Kash (cash). LoL
Hey, so I will share my 429 / holley 750cfm 3310s experience.
For my '78 Ford E250 4x4 Trekker-Van with an engine block casting D7TE (429), below is what I opted for.
I kept the 4300 motorcraft 4-bbl for smogging, and for performance, went with the alum Edelbrock intake and the Holley 750 man choke which is a 3310s. Can't remember the List number.
I haven't yet figured out the Difference between a 4150 and a 4160.
The 750 even works very well while out Cow-Trailing in 4x4 Low.
I'm liking the suggestion of purchasing a Holley "RE-FURBISHED" carb directly from Holley.
4160 = vacuum secondaries
Both variants are available with manual, electric or no choke.
4160 can be found with single fuel inlet or dual fuel inlet
All 4150 are dual fuel as far as I know
Mechanical secondaries are typically best for light vehicles, with manual transmission, or for racing applications
Vacuum secondaries are best for heavier vehicles and automatic transmission. Again, typically speaking. There are always other variables involved.
Either option offers a lot of adjustments.
With 4150 series it is much more important to get the proper CFM for your application, that's why they offer options in 50 CFM increments.
4160 aren't as picky about that with their vacuum secondaries and why you typically see 100 CFM increments once you get above 650 CFM.
Lead Driver
Joined: Oct 2018
Posts: 7,877
Likes: 2,365
The higher CFM only matters at high RPM, for all other driving you'd be better off with a 600 . and even then it's debatable if you'd notice any advantage on top, so unless 5000+ RPM is going to be a regular thing I'd go smaller.
But, a 750 will work fine I've done it more than once on similar applications.
But, a 750 will work fine I've done it more than once on similar applications.
Thread Starter
|
Cross-Country
Joined: Sep 2024
Posts: 78
Likes: 3
If going with a Holley, be sure to look at the factory refurbished part of their website (if buying directly from Holley).
I got a regular 600 cfm 4160 for about half price & a 500 cfm 4412 for less than half price that way. Made up for the obscene about they wanted for a 670 cfm off-road Avenger I bought & still haven't used. Got some MSD 6al boxes that way as well for about half price.
I got a regular 600 cfm 4160 for about half price & a 500 cfm 4412 for less than half price that way. Made up for the obscene about they wanted for a 670 cfm off-road Avenger I bought & still haven't used. Got some MSD 6al boxes that way as well for about half price.
Lead Driver
Joined: Oct 2018
Posts: 7,877
Likes: 2,365
Refurbished means a returned carburetor on warranty. you would think they were repaired right and probably most of the time they are. but you can find plenty of accounts where people were disappointed. if you shop around you can usually find a new one for not a lot more money.
Cargo Master
Joined: Nov 2009
Posts: 2,364
Likes: 117
From: starship enterprise
4150 = mechanical secondaries
4160 = vacuum secondaries
Both variants are available with manual, electric or no choke.
4160 can be found with single fuel inlet or dual fuel inlet
All 4150 are dual fuel as far as I know
Mechanical secondaries are typically best for light vehicles, with manual transmission, or for racing applications
Vacuum secondaries are best for heavier vehicles and automatic transmission. Again, typically speaking. There are always other variables involved.
Either option offers a lot of adjustments.
With 4150 series it is much more important to get the proper CFM for your application, that's why they offer options in 50 CFM increments.
4160 aren't as picky about that with their vacuum secondaries and why you typically see 100 CFM increments once you get above 650 CFM.
4160 = vacuum secondaries
Both variants are available with manual, electric or no choke.
4160 can be found with single fuel inlet or dual fuel inlet
All 4150 are dual fuel as far as I know
Mechanical secondaries are typically best for light vehicles, with manual transmission, or for racing applications
Vacuum secondaries are best for heavier vehicles and automatic transmission. Again, typically speaking. There are always other variables involved.
Either option offers a lot of adjustments.
With 4150 series it is much more important to get the proper CFM for your application, that's why they offer options in 50 CFM increments.
4160 aren't as picky about that with their vacuum secondaries and why you typically see 100 CFM increments once you get above 650 CFM.
4150/4160 information is totally untrue/inaccurate. 4150/4160 models is a designation of how the secondary metering is performed, vacuum secondary or mechanical secondary has nothing to do with it.
I have attatched from the holley master book in print and color 2 demonstrations of vacuum secondary 4150 as well as vacuum secondary 4160. please correct your incorrect statements.