Quote:
Originally Posted by mcgarrett
Separate the alloy (pot metal) upper carb body from the cast iron base which has the throttle butterflies. Look at the underside of the pot metal carb body and you will see a valve screwed into it. This is the power valve. If they are old, they can fail to operate correctly or leak and cause the float bowl to empty into the intake manifold causing a flooding condition. Most new carburetor kits will have a new power valve, or you can purchase one separately from some of the Early V8 parts suppliers.
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This point needs clarification: New power valves have an incompatible base to the old carburetors, as the old had a flat surface of the sealing base, the new have a radius. These new units can be machined in a lathe to fit, or if buying from a supplier, verify that operation has been done. Alternatively, I've heard that some have used an el-cheapo method by utilizing two washers instead of the correct single, but as this seal is critical to the operation of the valve, I cannot recommend this method.