Rochester Quadrajet's
I thought the 4MV flowed more than that! Ya lern sometin new every day! LOL
The 4MV {1 3/8" Primary x 2 1/4" Secondary} ~ {Venturi > 1.093" x AV}
Was rated at 750 CFM for advertising specifications.
Trenton State University
Tested the flow-rate and volumetric efficiency of the Rochester 4MV 750 Spreadbore.
Results
* High-Performance Big-Block .......... 735 to 740 CFM's
* Medium Performance Big-Block ...... 725 to 730 CFM's
* Low Performance Big-Block ............ 715 to 720 CFM's
* High-Performance Small Block ....... 665 to 670 CFM's
* Medium Performance Small Block ... 650 to 655 CFM's
* Low-Performance Small Block......... 640 to 645 CFM's
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In 1971,
Rochester did come out with another 4MV Speadbore which was
rated at 800 CFM's.
This Carburetor came thru with the same Throttle Bore sizes,
but had a larger 1.218 Primary Venturi.
It could be found on all 1971, 1972 and 1973 Buick 455's.
And also on the 1973 Pontiac SD-455.
