4 Barrel Carburetor fits for Rochester Quadrajet Carburetor For Chevy 350 454 327 427 V8 Engines GMC Trucks 1966-1973 big small block 4BBL Carb 1901R 4MV Corvettes 1975-1979 Manual Choke 650CFM 750CFM
Condition: New
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Availability:
In Stock.
Arrives
Thursday, Jun 11
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Features
- 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.
- 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.
Brand: THUNDERMINGO
Vehicle Service Type: Truck
Flange Type: Spread Bore
Fuel Type: Liquefied Petroleum Gas
Recommended Uses For Product: Replacement for 1901R
Brand: THUNDERMINGO
Vehicle Service Type: Truck
Flange Type: Spread Bore
Fuel Type: Liquefied Petroleum Gas
Recommended Uses For Product: Replacement for 1901R
Specific Uses For Product: Performance
Manufacturer: THUNDERMINGO
Model: 1901R
Item Weight: 7.11 pounds
Package Dimensions: 13.3 x 10.59 x 6.65 inches
Item model number: 1901R
Exterior: Polished
Manufacturer Part Number: 1901R
Date First Available: January 19, 2022
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, Jun 11
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
What AMAZING quality, I have had such probs with my 69 Corvette 427, the mechanic had my factory Rochester rebuilt TWICE and apparently still NO GOOD. I replaced my fuel pump all my vacuum lines and more, and still NO good. So I figured I would order this, I thought at that price I just could NOT go wrong. I installed today, it is 100% IDENTICAL to the stock one, it comes with all kinds and sizes of jets, KUDOS what XLNT company indeed. So installed, pumped the gas 3 times, turned the key and that MASSIVE 7 Litre MONSTER finally came to life, and my God it runs PERFECT, all pre adjusted and set just right. THANK YOU SO MUCH !!! OUTSTANDING Do NOT hesitate on this it's a FANTASTIC value... 3 years of the car not running right, and here for under $200.00 ... GREAT !!
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Reviewed in the United States on October 24, 2024 by Jan Harde
Fuel leaked out everywhere waiting for my refund don't purchase didn't work at all
Reviewed in the United States on February 15, 2026 by Michael
This carburetor was surprisingly good out of the box. The documentation is rather clumsy and all over the place, but you can find general quadrajet documentation just about anywhere, so reference that for your initial tuning. The float was adjusted correctly and did not have any issues with the upper plate. The carburetor bolted on and started up straight out of the box and required minimal adjustment. It is important to point out that the quadrajet carburetors do not handle high pressure well and these are no exception! I've found that these will take up to about 8psi at most before they push past the needle and seat and cause the leaking you commonly read about. You must either install a regulator to keep your inlet pressures down or run a fuel pump specifically designed to provide low pressure. DO NOT BLINDLY TRUST YOUR FUEL PRESSURE! Many of the aftermarket replacement fuel pumps are putting out too much pressure for the quadrajet, even if it is listed as a direct replacement! Always check your fuel pressures or buy a quality low pressure and high volume replacement. If you are looking for a cheap and basic replacement for your quadrajet and are not chasing peak horsepower numbers, these will work surprisingly well if you set them up correctly.
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Reviewed in the United States on November 4, 2024 by James
Installed on 72 gmc sprint 350. Worked perfectly.
Reviewed in the United States on January 15, 2026 by Assmassa
After adjusting this carb it is a good carb but it was adjusted wrong. A brass float is adjusted differently than a plastic float. The important thing is to adjust so the high center of the float isn’t touching the top of the chamber. It overflowed after the first time starting it. See a lot of people have this complaint. Then it failed emission standards miserably as delivered. I’ve had the top off of this too many times trying to set it. In the end the #33 jets with the primary jets you installed it passed emissions test. Just took it on a 300 mile round trip without an issue. I installed it on a 454 chev big block 7.4 now I question if the jets you provided could set this carb for a small block since I’ve tried almost every possible setting and only got smoke with every other try. It ran as delivered but not right and if customer isn’t pushing 500 horse power or more then it will not work. Way too much fuel. Great carb very responsive steady power. I’d buy again but knowing it needs to be opened and rejetted and float adjusted not plug and play. Thundermingo have you ever installed on an engine and tried? Not jetted like my stock gm carb came. So buyers open it up set the float properly and install #33 jets and you MIGHT LOVE IT
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Reviewed in the United States on September 20, 2024 by Kelly
Really liked the bolt on of this carb. Fit right on and worked great after I had to get the right Carb mounting gasket for it. The one in the kit didn;t cover the exhaust ports on top of the intake and i had to go get the right one. After the install it ran very good and even took it on a long test drive. 1972 Monte Carlo with the stock 454 in it.
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Reviewed in the United States on December 16, 2024 by Shayne
Bolt on but the idle is crazy an adjustment screws not changing anything idk if floats are stuck or not won’t let me post video but I’ll mess with a little more in morning if if doesn’t idle down I’ll have to send back because it’ll blow my motor arm was a bit bent but that’s about it
Reviewed in the United States on February 27, 2026 by Antoine Kenneth Hildreth
The carb came in very fast and correct. The fit was perfect. All factory hook ups were perfect. Put a little fuel down carb to help it start faster and it fired right up. T idel screws were almost perfect right out of the box. Se the idel to 800 and went for a ride. Very good factory replacement carb.
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Reviewed in the United States on January 26, 2025 by keith gillis