The B.B. in the title represents that this is from the archive of the late Bill Bently, who ran a flathead Q&A informational site before he passed away. All threads from this source will be titled using the B.B. identifier on this site. We’re archiving some of the threads, so that his work is not lost or forgotten and so they will continue to educate flathead enthusiasts for years to come.
From Flat32
Holley Carburetor Modification
It’s not rocket science to be sure, just retrofitting later model Holley parts in the older model carb. The 1 1/16 venturi carbs were used on ’57 and later Y blocks and probably on other makes besides Fords. The whole carb could be used to replace a 94 if a guy wanted to juice up a single carb stocker, but the intake manifold would need to be bored out to take advantage of the larger butterflies.
The parts fit with no modification, but I also changed jets down to 44’s, used 6.5 power valves and a real careful standard assembly. Drove across the country and figure to either drop down to 42 jets or lower the float levels a tad because of gas mileage.
I sure would like if somebody else made the change and got the same good results I got, would make me more confident in telling folks to do it.
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