Technical Inlet thread size - Rochester 2Jet

I need to fit a 3/8 or 10mm hose tail to this inlet. Anyone know the likely size of the internal thread. Looks very close to 5/8 UNC but probably some sort of pipe thread.

Imperial and US fittings getting more difficult to find over here these days.

Thanks

Sent from my moto g(8) power using The H.A.M.B. mobile app

 

Do you mean the thread in the carb body, or the steel adapter screwed into it? If the steel adapter, the line connection would be a 5/16 inverted flare. In the US we can buy a fitting that's hose barb on one end and inverted flare on the other.
Bob

 

Could be 1/4" , 5/16", or 3/8" inverter flare, GM used all three sizes. Check your local source for steel brake line and make your own piece as long or short as you want.
https://quadrajetparts.com/inlet-fittings-c-72_87.html
https://www.carburetion.com/r2.asp

 

Thanks guys. Found it on the Quadrajet website. Got someone on this side of the Atlantic who can source one.

Sent from my moto g(8) power using The H.A.M.B. mobile app

 

Not sure what you want to do Blackjack, and I maybe too late, but Stromberg sell banjo fittings for Strombergs that fit 2g’s