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Or, you could install an external adjustable fuel pressure regulator that will permit lower pressures that work well with both Carter YH and Rochester Corvair carburetors, as described below...
bbodie52 wrote:The Carter YH carburetor has a well-known problem with fuel control... often due to excessive fuel pressure. Your carburetors may be experiencing a similar problem. If your fuel pump pressure is high you might consider adding a fuel pressure regulator between the pump outlet and the carburetor inlets, like the one from Holley shown below...
Holley manufactures quite a few fuel pressure regulators, but most have a range of 4.5 - 9 psi or higher, or are designed for a fuel injection system. This unit has the correct range and apparently a good reputation...
CHROME CARBURETED FUEL PRESSURE REGULATOR
Street/Strip Carbureted Applications
Two Port
Adjustable from 1 to 4 PSI
PART# 12-804
bbodie52 wrote:Holley fuel pressure regulators are designed to precisely control the fuel pressure from the fuel pump to the carburetor. Too much fuel pressure for a given needle and seat assembly can overload the needle and seat and may cause flooding or drivability problems. Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. All Holley regulators are pre-set at the factory at 2.8 PSI so there is no guesswork when first installing the regulator. The Holley 12-804 fuel pressure regulator features 3/8" NPT in/out ports.
Features:
While searching the web I stumbled on this interesting set of videos...
slickraft 
https://www.youtube.com/channel/UCqetUo ... b8KEzmikpA
1966 Corvair Corsa Convertible
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