If the fuel delivery system is stock, then the YF used on Chevrolet engines WILL flood if the typical FLAPS fuel valve is used.
If an electric pump has been added, then the addition of a regulator with a bypass is pretty much mandatory.
The typical inline dial type regulators from your FLAPS regulate pressure by restricting volume. If the engine is used in a race vehicle, and using the rated fuel flow capacity of the regulator, the the regulator will work (sort of). If the engine is at idle, changes are good the output pressure from the regulator is IDENTICAL to the inlet pressure.
These regulators are quit useful.......................IF you have a strong right arm, and a rabbit problem in your garden.
Adding a bypass regulator may still not solve a flooding issue if the FLAPS kit fuel valve is used.
The most common valve used in the YF carbs designated for Chevrolet use is part number 25-239s, with an orifice of 0.081 inch. The typical FLAPS valve would be a non-spring-loaded replacement for 25-1076s with a 0.101 inch orifice.
Jon
