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The Quadrajet is a four barrel carburetor with a "spread bore" throttle plate, made by the Rochester Products Division of General Motors. Its first application was the new-for-1965 Chevy 396ci engine .
It was rated at 350 hp (261 kW) and 440 lb⋅ft (597 N⋅m) of torque with a Rochester 4-barrel, and 360 hp (268 kW) with the L69 tri 2-barrel option in 1966. A nominal 360 hp was claimed in 1967 when equipped with a W30 camshaft, 4-barrel, and outside air induction, 502 of which were factory produced.
The 4.4 L; 267.8 cu in (4,389 cc) engine had the 350's crankshaft stroke of 3.48 in (88.4 mm) and the smallest bore of any small-block, 3.5 in (88.9 mm), shared with the 200 V6 introduced a year earlier. It was only available with a M2ME Rochester Dualjet 210–effectively a Rochester Quadrajet with no rear barrels.
[citation needed] The last major carburetor design by Rochester was the Varajet II, [citation needed] essentially a Quadrajet halved lengthwise, [citation needed] and was one of the few successful progressive 2-barrel carburetors. [according to whom?] It was installed on 4- and 6-cylinder engines from 1979 to 1986. [citation needed]
The Tri-Power carburetion system was replaced with a single 4-barrel Rochester Quadrajet carburetor. The 389 cu in (6.4 L) engine received a larger cylinder bore 4.12 in (104.6 mm) for a total displacement of 400 cu in (6.6 L) V8, which was available in three models: economy, standard, and high output. The economy engine used a two-barrel ...
A larger 4 in (101.6 mm) ram air flex duct to the air cleaner from the left-hand fender, specific carburettor calibration for the Rochester Quadrajet, a "T/A 4.9" callout on the shaker, 60 psi oil pump, and cam similar in grind to the 220 hp (164 kW) 400 from the 1978–1979 model year were also included.
The final Chrysler use of four-barrel Carter carburetors was the Thermo-Quad, which used a lightweight thermoplastic float bowl, on the most powerful Chrysler engines. [1] Carter produced Rochester Quadrajet carburetors for their rival maker whenever demand outpaced Rochester's ability to make them. They were identical to Rochester's units ...
Rear-wheel-drive cars and the Commercial Chassis for hearse and ambulance builders used the Rochester Quadrajet 4-barrel carburetor. Cadillac referred to this new TBI (throttle-body fuel injection) system as Digital Fuel Injection (DFI); this particular induction system was later adopted by other GM divisions, except on Oldsmobile V8s, and was ...