Timing issue?

70DUSTER/74SCAMP said
I adjusted the front float to middle level of the sight glass . used a 5/8 wrench and went clockwise to lower the float. i did that on the rear and it just bottomed out no more adjustment and sight glass is plum full in secondary. using a stock pump mechanical. i get how techinically just dont know why it wouldnt lower the float. front went down just fine like i said it just bottoms out no more adjustment to give.

From a Holley forum
Float And Fuel Level Adjustments On Holley Four-Barrel Carburetors - Blogs - Holley Performance Products Forums

a) Begin by lowering the fuel level in the fuel bowl to bring down the float. With the engine off, remove the sight plug and allow excess fuel to drain from the sight plug into a rag. Rock the vehicle a little to slosh additional fuel out of the bowl. Failure to lower the fuel level below the sight plug before adjustment will result in a bottomed out float in the floor of bowl.