Carburetor Classics: The Hailed Holley 4150

Holley soon came out with an extensive range of interchangeable components to tailor the 4150 to almost any performance use. The original side-hung float bowls (which were not disturbed by vigorous acceleration) were best for drag racing, while oval and road course racers preferred center-hung floats (which were less affected by cornering). Floats, metering plates and virtually every other part of the 4150 could be altered at will. Interchangeability made the Holley much easier to tune and modify than any other four-barrel carburetor.


Initially the four venturis were arranged in a square pattern that fit manifolds used by Ford and Chrysler (Chevrolet manifolds were drilled in a rectangular pattern for use with Rochester carburetors). Devin Enterprises in California introduced the first intake manifold to adapt the 4150 to the Chevy small-block in 1959, and soon Chevy had its own Holley-friendly manifolds for big and small-block Corvettes and Camaros.


The list of famous (and today hyper-valuable) musclecars with Holley carburetion is without equal. Holley four-barrels graced the engine compartments of the dreaded 427 Cobra S/C, the high-compression 426 Mopar Hemi and the race-winning 427 L-88 Corvette. Other Holley-equipped notables include the AMX SS, Yenko 427 Camaro, SS-454 Chevelle, Coronet 440 Six-Pack, Hemi-'Cuda and the Shelby GT-350.


The success of the 4150 led to the development of specialized Holleys of similar configuration. The 4160 model looks a lot like a 4150, but has an inexpensive (and less adjustable) metering plate that replaces the metering block on the secondary side of the carburetor. These cheaper Holleys were also slightly shorter in length, making them easier to fit on dual-carb manifolds.


The 4500 Dominator is a huge, race-only carburetor of over 1,000 cfm that is based on 4150's design principals, even though few parts are interchangeable. The 4165 from 1971 was a spread-bore version of the 4150 designed to replace Rochesters on older Chevy manifolds. Holley also made a three-barrel (with one big secondary venturi instead of two) version called the 3160, but it had a short life. More successful was the 2300 two-barrel carb, which was basically half of a 4150. These were very successful in racing classes that required two-barrel carbs, and on triple-carb setups for big-block Corvettes and Mopars.