66 cater avs - Impala Tech
General Tech For best results use forums below.

LinkBack Thread Tools
post #1 of 2 (permalink) Old 09-01-2020, 12:50 PM Thread Starter
Join Date: Sep 2020
Posts: 3
66 cater avs

I have 275 hp 327 and i was wondering what the cfm for the carter avs was, seen 630, 650 and 750
tag number 3875966 4028 sa
Chuck Stumpf is offline  
Sponsored Links
post #2 of 2 (permalink) Old 09-01-2020, 02:33 PM
Join Date: Jan 2006
Posts: 13,023
4028S was rated at 500 cfm.

That is the reason everybody in the sixties was bolting on a 650 to 750 cfm Holley on their 327 engines.

Carter only sold 375 to 500 cfm carbs back then (late fifties to early sixties), so to get more cfm rating you had to use two carbs such as appeared on the 283 Corvette engine or the 425 horse 409. Multiple carbs results in multiple headaches come tuning time, which is why one big Holley superseded two smaller Carter AVS or AFB's.

It is true today which is why Holley makes a Dominator in up to 1450 cfm in one carb (though they still sell twin 750 Dominators for BBC Pro Stock motors to put on top of a Wilson fabricated manifold for your museum piece since the Manufacturers pressured the NHRA into requiring EFI on their cars for the past four years now).

Carburetors still out perform EFI and the switch over slowed the cars down for two years running. They finally got multiple injectors to match the performance of a carb but the computer doesn't like the transition from free wheeling the clutch to a hard launch so consistency off the line still suffers (in case you wonder what is wrong wuih the drivers and tuners because the independents with out big bucks can't find traction off the line.

Big Dave
Big Dave is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Impala Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome