The only permanent reliable/effective repair is to install a heli-coil insert, it is stronger than the original material. You do loose a tiny amount of sealing surface for the gasket, but we've never had a problem with them sealing up.

This repair should only be done by someone highly skilled with the correct equipment to make sure the filter housing is in correct alignment with main body for even contact all the way around the seal.

Using the expanding fittings is NOT recomended, they can come out, and burn your expensive restoration or Muscle car to the ground. They also swell up the carb and make installing a heli-coil and getting a good seal at the housing more difficult.

Same thing with oversize fittings, they chew up good material used to seat the heli-coil insert.

We charge $45 plus shipping for this repair, and have done hundreds of them without any problems. The only carburetors which do NOT take this repair well, are very early 1967 units that have had an expanding fitting in them at any point, as they are extremely thin in this area to start with.

We can also "spot face" the front of the housing if the seal area is damaged (common problem), and can machine off a small amount of the casting if an expanding fitting has it swelled up to much to get an effective seal at the gasket......Cliff

cliffshighperformance.com