Oldsmobile F85 with rochester 2GC carb
#2
If the carburetor has no inlet threads, I believe the correct size is 7/8-20 male (Thread length: .525") 5/8-18 female w/ inverted flare - same for both the 2G & 2GC (7/8" diameter inlet with 3/8" steel fuel line). You'll need to validate this, but I'm rather confident regarding the sizing at least up until 1972. I've read there was a change in sizing from 1973 forward, but I don't know.
Here is a self-tapping fuel inlet fitting: https://quadrajetparts.com/self-tapp...ing-p-130.html
More inlet sizes. Some you can go oversize or downsize based upon configuration parameters. Note some have extra length if required: https://quadrajetparts.com/inlet-fittings-c-72_87.html
Here is a self-tapping fuel inlet fitting: https://quadrajetparts.com/self-tapp...ing-p-130.html
More inlet sizes. Some you can go oversize or downsize based upon configuration parameters. Note some have extra length if required: https://quadrajetparts.com/inlet-fittings-c-72_87.html
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