New Rochester Quadrajet Carburetor for Chevy big and small block engines 1966-1973 - 750 CFM 4BBL

Fitment: 1. Carburetor Fits: - 1970-1972 V8 Chevy big block Mark IV 6.6L/402 - 1967-1973 V8 Chevy small block Gen I 5.7L/350 - 1966-1970 V8 Chevy big block Mark IV 6.5L/396 Street - 1966-1969 V8 Chevy small block Gen I 5.4L/327 Street - 1966-1969 V8 Chevy big block Mark IV 7.0L/427 Street - 1970-1973 V8 Chevy big block Mark IV 7.4L/454 - 1970-1973 V8 Chevy small block Gen I 6.6L/400 - 1967-1968 V8 Chevy small block Gen I 5.4L/327 - 1968-1969 V8 Chevy big block Mark IV 6.5L/396 - 1969-1973 V8 - 1970-1973 V8 Chevy big block Mark IV 7.4L/454 - 1971-1972 V8 Chevy big block Mark IV 6.6L/402 2. Replaces Part Numbers: Directly replacement 4-BBL carburetor Replace For 1901-GG Rochester Quadrajet Carburetor- 4MV - 1966-1973, 1975-1979 Corvettes, 1968-1973 Chevy/GMC Trucks Part Number 1901R. Interchange with Chevy 7026202 7026203 7026210 7027202 7027203 7027212 7027213 7040007 7040021 7046904 7047207 7047303 7047305 7047306 7047307 7047316 7047319 17054236 17054709 170549.

General Description: The Quadrajet carburetor is a 4-barrel two-stage down-draft carburetor known for its simplicity in construction and adaptability to engines of various sizes. It comes in three basic models: 4M, 4MV, and 4MC, each with different choke operations. The float system of the carburetor includes a centrally located fuel reservoir and various types of float needle valves to maintain consistent fuel levels.

Idle System: The Quadrajet carburetor features an idle system on the primary side to ensure proper air/fuel mixture ratios during idle and off-idle operation. This system operates in the two primary bores of the carburetor and consists of several components such as idle tubes, idle passages, and idle discharge holes. During curb idle, fuel is mixed with air through vacuum application to produce a combustible mixture for engine operation.

Specification: - Carburetor For Rochester Quadrajet can range from 600 to 800 CFM, with most models rated at 750 CFM. - Pre-installed jet sizes include: Main jet - 185mm, Idle jet - 120mm, Auxiliary Venturi - 7.3mm, Venturi - 28mm, Air correction jets - 110mm, Needle valve - 3.3mm.

Customer Service: Before purchasing, ensure compatibility with your vehicle's carburetor. Check the provided pictures and consult with us if needed. Installation videos are recommended for proper installation. The product does not include installation instructions.

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