Holley Modular Carbs: Model 2300, 4150, 4152, 4160, 4180, 4190, 4165, 4175
The 'modular' Holley carburetor debuted in 1957. It was used on most makes at one time or another after that. The new design replaced the earlier 'concentric' Holley carbs. These carburetors were produced in 2, 3 and 4-barrel variations and are still available as aftermarket performance and replacement carbs today.
The model 4150 shown above has a secondary metering block, whereas the 4160 carbs have a metering plate. This List 4627 carb has 'competition' style float bowls. These have a 'center-hung' float, so the needle/seat is in the center of the float bowl and the fuel inlet is angled upward from the left or right. They use float F7007. Carbs with center hung floats have separate fuel inlets on the two float bowls, so there is no transfer tube from the front to back as on carbs with side-hung floats.
