[rpmerf]

https://www.corvetteforum.com/forums...o-i-epoxy.html

4. Last, the leaking fuel plugs. In 25 years of building Q-Jets, I have seen 1 (ONE) Q-Jet with leaking plugs. The plugs in question are the primary well plugs and the secondary well plugs. With the throttle plate removed off the bottom of the carb, these are the two big silver plugs in the middle of the carb (secondary well plugs) and the two smaller plugs right at the bottom of the protruding casting slightly forward of the secondary plugs. You can test these very easily: Just pour a little gasoline or lacquer thinner into the float boal and set the float bowl up level on your work bench. After an hour or so, check the well plugs to see if they're wet. If they're not wet, the plugs don't need to be sealed. If they're wet, you need to seal them.

If you need to seal them:
The secondary plugs are best sealed by simply using the well gasket seal found in any Echlin brand carb kit. Echlin provides a rubber gasket that drops into the well recess in the throttle plate, and this will seal the secondaries.

Sealing the primary plugs by simply coating them with epoxy is a waste of time: The epoxy will quickly leak, and simply doesn't work. If you want to permanently seal the plugs, drill the plugs and tap them for a 10-32 screw. Buy a couple of 10-32 x 1/4" countersunk allen-head scews from a good hardware store. Coat the screws with JB-Weld, and screw them into the drilled plugs. This will positively seal the wells, and they will never start leaking again.