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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 .
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.
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.
[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]
In 1985, the 4.3 L (262 cu in) was either equipped with throttle-body fuel injection (RPO LB4) or a Rochester Quadrajet four-barrel carburetor (RPO LB1). The Chevrolet Caprice, Chevrolet Monte Carlo, Chevrolet El Camino , Pontiac Parisienne, and Pontiac Grand Prix used the LB4 rated at 130 hp (97 kW).
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 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 ...
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 ...