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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 M4ME (E4ME for 1981) 800 cfm Rochester Quadrajet, unique to the 301 Turbo, had super rich "DX" secondary metering rods and a remote vacuum source for the primary metering rod enrichment circuit; the "PEVR" or Power Enrichment Valve Regulator.
The LA engine was available until 1991, when it was superseded by the Magnum version. It used hydraulic lifters and a two-barrel carburetor for most of its production, though four-barrel Carter Thermo-Quad and Rochester Quadrajet carburetors were used in police applications starting in 1978 and 1985, respectively. The 318 two-barrel ELD ...
Some early 307s were painted GM Corporate blue, but most were painted satin black. It was used in most Oldsmobile models, as well as those from Buick, Cadillac, Chevrolet, and Pontiac. Every 307 used a four-barrel carburetor, which was a variant of the Rochester Quadrajet, usually the CCC (Computer Command Control) Quadrajet.
The first iteration of the 305, the LG3 was introduced in 1976. This variant used a Rochester 2GC carburetor from 1976 to 1978. In 1979, the more fuel-efficient Rochester Dual-Jet two-barrel carburetor replaced the older 2GC. This change also resulted in a drop in power to 130 hp (97 kW) and 125 hp (93 kW) for California emissions cars.
In 1937 Rochester Products was founded, planned as a second plant for Delco Appliance, but achieving Division status by 1939. [6] In 1953 an advertisement in Life stated: "Rochester builds original equipment carburetors for Chevrolet starting with 1950, Oldsmobile from 1949 and Cadillac
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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.