David, I don’t have a technical answer but I have a theory…
When you go to remove the carburetor, the nuts don’t suddenly “crack” loose… they release gradually and evenly.
I assume this is due to the very fine threads combined with some rebound on the compressed gasket material. Also the carburetor flange is soft metal so the nuts seem to bite into it just a little… like I said, it isn’t a scientific engineering answer, just an observation.
I have never had one come loose at the mounting studs, but I have had the bowl come loose from the base plate!
SHORT BED 4-DOOR DIESEL: 1986 F350 4x4 under construction-- 7.3 IDIT ZF5+GVOD
STRAIGHT SIX 4X4: 1981 F150 2wd to 4x4-- 300 I6 close ratio diesel T19, hydroboost brakes, Saginaw steering
BIG F: 1995 F-Superduty under construction— converting to 6.9L IDI diesel ZF5+DNE2