[Kenth]

Originally Posted by srmmmm

Finally had a chance to take in some of Cliff's experienced recommendations and did a careful reassembly of the carb. Three discoveries along the way: 1) wrong base gasket (left side of picture), 2) float height was set at 5/8" instead of 5/16", and 3) float pivot pin protruded above the level of the float bowl casting lifting the float bowl gasket and potentially binding the main metering rods.

It's back on the engine but waiting for daylight hours so I don't wake the neighbors when I start it.

1. Flange gasket to the left is correct for 1971 Buick units. Gasket to the right is for 1965-69 Chevy intakes which needs a steel shim on top of it.
2. Correct float setting for 7041242 is 13/32".
3. The slightly protruded float pivot pin is pushed down by the airhorn, with gasket in between, and holds the float in secure location. There is NO way it could cause binding of the primary metering rods.

7041242 uses #75 main jets with 45B primary rod, AV secondary rods and #7011957 power piston spring from factory.

FWIW