Replace: This is brand new 4-BBL carburetor from THUNDERMINGO can directly replace for the Rochester Quadrajet.Replace For 1901-GG 1901R Rochester Quadrajet Carburetor- 4MV. NOTE:This carburetor is suitable for automotive. We do not recommend it for marine purpose.
Fitment: Vacuum Secondary,divorced choke,Spread bore carburetor, more suitable for dailydrive.Carburetor compatible with 1966-1973 Chevy 327-454c.i, 1975-1979 Corvettes, 1968-1973 Chevy/GMC Trucks Part Number 1901R.compatible with 1966-1973 Chevy Chevrolet GMC Cadillac Fits 327 350 427 454 with Divorced Mechanical Choke.Important: Before purchasing, ensure the carburetor size you need to replace matches the product.
This Universal Performance carburetors improve throttle response and overall performance throughout the RPM range. Each carb has a distinctly different fuel curve calibrated for a particular application. Do note: Condering the vehicle dispacement range discrepancy, For small block engine applications, minor idle circuit adjustments may be required. You may have to use The included tool and small copper solid pin to block the air channels to fix it. For specific methods, please refer to the details page picture(A guidance to improve idling ).
Specification:Carburetor For Rochester Quadrajet can range anywhere in between 600 and 750 CFM. Most are rated 750 CFM. The size of jets that pre-installed:Main jet: 185, Idle jet: 120, Auxiliary Venturi: 7.3mm; Venturi(Choke tube):28mm, Air correction jets: 110, Needle valve: 3.3.
Before purchasing, please check carefully whether the carburetor you need to replace is the same as this product.We recommend that you search for relevant installation videos on the Internet and follow the correct steps strictly. No installation instructions included.Tuning may be needed depending on your setup. For best results, we recommend having a qualified mechanic install and tune the carburetor.