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The much smaller primaries act as a small two-barrel carburetor until the accelerator is pressed far enough to start to open the secondaries. The small primaries allow the primary throttle plates to be opened wider, and thus making the carburetor more efficient than a large two barrel, or square bore four-barrel. Drivability.
[1] The company today marks its official starting date as 1903 when they started mass-producing carburetors for Henry Ford. [2] "Their first original carburetor, called the iron pot, appeared on the curved-dash Oldsmobile in 1904." [3] In April 1905 Holley Brothers Company was established with an address at 661-75 Beaubien St., Detroit ...
Autolite 4300A Carburetor. The Autolite 4300 was a four-barrel (four venturi) carburetor manufactured by Autolite in multiple variants from 1967 through 1974. Used by both Ford and AMC, it was produced as an emissions-compliant replacement for the previous Autolite 4100 model, and was superseded by the Motorcraft 4350.
With a 4-barrel carburetor and 10.25:1 compression, the Olds 215 made 185 hp (138 kW) at 4800 rpm and 230 lb⋅ft (310 N⋅m) at 3200 rpm with a manual transmission. With a 4-barrel carburetor and 10.75:1 compression, the Olds 215 made 195 hp (145 kW) at 4800 rpm and 235 lb⋅ft (319 N⋅m) at 3200 rpm with an automatic.
This engine was identical to the 425 hp (317 kW) L72 427 (first introduced in 1966), but was fitted with 3×2-barrel Holley carburetors, [32] known as "Tri-Power," in lieu of the L72's single 4-barrel carburetor. Both engines used the same high-lift, long-duration, high-overlap camshaft and large-port, cast-iron heads to maximize cylinder head ...
In 1967 Chevrolet introduced the L71, a variant of the L72. This new engine had three 2-barrel carburetors - known as "tri power" - in lieu of the single 4-barrel of the L72, and a 435 hp (324 kW) rating. Aside from the intake setup, the two engines were identical.
Also available in the Bel Air sedan, the basic passenger car version produced 162 hp (121 kW) with a two-barrel carburetor. Upgraded to a four-barrel Rochester, dual exhaust "Power Pack" version, the engine was conservatively rated at 180 hp (134 kW), and with the "Super Power Pack," it was boosted up to the power level of the Corvette. [17]
The first of the "big journal" Pontiac V8s, it had a bore and stroke of 4 + 3 ⁄ 32 in × 4 in (104.0 mm × 101.6 mm) and came with dual four-barrel carburetors. It featured 3 + 1 ⁄ 4 in (82.6 mm) main journals (which the legendary Smokey Yunick reputedly left Pontiac's engineering department over).