4053/4346 Holley

[69 Post Sedan]

Is a Holley 4053 or a 4346 a 780 or a 800 CFM? I get conflicting answers depending on where I look. In Jerry MacNeish's book, he states it as a 800 but I was always told it's a 780 plus it's stated that way on the CRG website among most others.

I might be splitting hairs but I was in a friendly conversation with a friend and he was going off of Jerry's book and I was going more off of experience.

Thanks, Kurt

[danachevroletfor1967]

I can't remember where I read it but for a Holley 4053, Holley rated it at 780 CFM while GM rated it at 800 CFM. I think that is why we see it rated at both of those figures depending on the book, magazine, article, etc.

[Keith Tedford]

The 4346 is a 780 cfm carb but could be any number depending on how you measure the flow. The numbers were approximate and, like horsepower numbers, were more for advertising than reality.

[WILMASBOYL78]

If you look in the back of the old "How to hotrod BB Chevys" book...you will see that they list it as 800 CFM in all the high horse applications. But, what 20 CFM's between friends..??

wilma

[mockingbird812]

<span style="font-size: 17pt"><span style="color: #33CC00"><span style="font-weight: bold">Don Yenko listed them as &quot;800 CFM&quot; for the Deuces</span> ...</span></span>

http://img.photobucket.com/albums/v697/mockingbird812/sYc%20site/79799-DEC-2.jpg
http://img.photobucket.com/albums/v697/mockingbird812/sYc%20site/yenkodeucespecsheetscan2.jpg

[69 Post Sedan]

Thanks guys....I did find this on the CRG website:

&quot;Although Holley rates this carburetor as 780 CFM, Chevrolet specifications and advertisements showed it as 800 CFM.&quot;

http://www.camaros.org/carb.shtml#_ftn2

Again, I know I'm splitting hairs but like Keith said, it's more for advertising, especially when the Holley, who made the carb, has it listed as a 780.

Either way...I learned something.

Kurt

[Chevy454]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Keith Tedford</div><div class="ubbcode-body">The 4346 is a 780 cfm carb but could be any number depending on how you measure the flow. The numbers were approximate and, like horsepower numbers, were more for advertising than reality. </div></div>
That rings a bell...like a dyno or any other measuring device, for carbs there are different correction factors, wet vs dry ratings, inches of Mercury (4bbl carbs were measured different than 2 bbl)...I wonder if Holley's SAE factor was the same as GM's?