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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both Ford and AMC, it was produced as an emissions-compliant replacement for the previous Autolite 4100 model, and was superseded by the Motorcraft 4350.
It was initially offered as the "non-catalogued" option S42 in Chryslers (the number of such produced is uncertain), offered with 373 or 385 hp (278 or 287 kW) via a single 4-barrel carburetor (11.0:1 or 12.0:1 compression ratio, respectively), or 413 or 421 hp (308 or 314 kW) via ram-inducted dual four-barrel carburetors (with the same ...
This system relied on hot air drawn from a small heat exchanger in the intake manifold—and later models, (generally 1978-onward), relied on the vehicle's 12 volt system to power a heating element and spring as the engine's temperature increased. Quadrajet carburetors were also built under contract by Carter. This was due to the fact that ...
The engine came with 543797 (4-barrel) and 9770716 heads for the tri-power and special exhaust manifolds and a 7H cam with 292deg. intake duration and later 1964 L with 288deg intake essentially the same as the 068 cam. #9770716 aka "716" heads featured a 170cc intake port volume, and were considered a milder "street" version of the vaunted ...
A 4-barrel carburetor was mated to a high-rise, dual plane intake manifold feeding high-flow cylinder heads that are still considered among the best of that era. [ citation needed ] Its big ports used 2.02 in (51 mm) intake and 1.60 in (41 mm) exhaust valves.
Engine bay of a 1967 AMC Marlin with a 4-barrel 343 Typhoon V8 Engine bay of a 1969 AMC AMX with a bare V8 block. The new-generation AMC V8 was introduced in 1966 [17] It is sometimes referred to as the "Gen-2" AMC V8. The first version was the completely new 290 cu in (4.8 L) Typhoon V8 introduced in a special mid-1966 model year "Rogue" hardtop.
A unique intake manifold that used the 48 mm (1.9 in) twin-bore throttle body from the 5.7L TPI Corvette engine was used on the engine's top end. [9] The turbocharged 4.3 L (262 cu in) was last used in the GMC Typhoon in the 1993 model year. The engine produced 280 hp (209 kW) at 4400 rpm and 360 lb⋅ft (488 N⋅m) of torque at 3600 rpm.
A 'power valve', which is a spring-loaded valve in the carburetor that is held shut by engine vacuum, is often used to do so. As the airflow through the carburetor increases the reduced manifold vacuum pulls the power valve open, allowing more fuel into the main metering circuit.
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