[Adger Smith]

Take the jets in the carb + the PVCR and figure the total area.
Then take the sizes of the needle & seats. Figure that area.
The two total areas should be close to equal.
Then take a Blue Holley Regulator apart and measure the size of the hole in it. Then figure the area. But wait to get the actual area you need to subtract the area of the pin from the diaphragm that works through the hole & pushes on the check ball. (that pin is a restriction) The flow of you system should more than match what you are flowing at the carb. Area is not the real way to figure it, but is the easy way & is close enough for our use. If it isn't right it could cause float levels to change and down track performance be affected. BTW check the size of the pump inside, too.