Rochester Quadrajet Carburetor New 4 Barrel Quadrajet Carburetor 1904R 1906R 4MV 4BBL Carb Fits for Chevy Chevrolet 305 350 c.i Engine V8 GM Cadillac 1980-1989 Vacuum Secondary 750 CFM Electric Choke
Condition: New
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- Replace : This is brand new 4-BBL carburetor from THUNDERMINGO can directly Replace For 1904R 1906R Rochester Quadrajet 4MV electric choke 4-BBL carburetor. Not for use with computer controlled vehicles.We do not recommend it for marine purpose.Note: Our carburetor version does not include the electrical plugs and AC throttle kick-up assembly.
- 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, some vehicles may be too rich with black smoke from the muffler, You may have to use The included tool and small copper solid pin to block the air channels to fix it, If you are confused, Message us before any adjustment.
- Specification: 4-BBL carburetor from THUNDERMINGO For Rochester Quadrajet can range anywhere in between 600 and 800CFM. Most are rated 750 CFM.NOTE:This carburetor is suitable for automotive.The size of jets that pre-installed:Main jet: 190, Idle jet: 120, Auxiliary Venturi: 7mm; Venturi(Choke tube):31.7mm, Air correction jets: 190, Needle valve: 3.3.
- Before purchase, 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. Carburetor is fully tested and ready to install. Tuning may be needed depending on your setup. For best results, we recommend having a qualified mechanic install and tune the carburetor.
Brand: THUNDERMINGO
Vehicle Service Type: Car
Flange Type: Bolt On
Fuel Type: electric
Recommended Uses For Product: Trucks
Brand: THUNDERMINGO
Vehicle Service Type: Car
Flange Type: Bolt On
Fuel Type: electric
Recommended Uses For Product: Trucks
Specific Uses For Product: Performance
Manufacturer: THUNDERMINGO
Model: 1904R 1906R
Item Weight: 7.98 pounds
Package Dimensions: 13.5 x 11.57 x 6.61 inches
Item model number: 1904R 1906R
Exterior: Polished
Manufacturer Part Number: 1904R 1906R
Date First Available: January 19, 2022
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To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
I bought this carb to fit my truck, and it took me no more than 10 minutes to install, and go on a2 hour trip. Carb worked well, great on gas, auto chock works made my engine idle smooth . The price is cheaper than a rebuilding my old carb.
Reviewed in the United States on July 9, 2023 by roger mehani
Casting flaw in base plate. Did not see until we spent months trying everything to get it to run right. Took carb off and noticed a casting flaw. This flaw has the media blast marks so this was done prior to finish/milling of the unit. Secondary air flap spring was broken needed to disassemble and reinstall spring. Quality control is lacking. Sent numerous messages through Amazon to get resolved and no response. Just want a new one or refund.
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Reviewed in the United States on October 29, 2024 by Amazon Customer Amazon Customer
Husband is very happy
Reviewed in the United States on October 16, 2024 by Jenny
Item looks great and bolted right on to my truck. I did have to adjust the idle screws and the power valve a little. The biggest problem was i had to back out the electric choke a full 1/4 turn to get it to kick off. That is way past the marks and pointer on the adjustment area. You can't beat the price!
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Reviewed in the United States on July 17, 2024 by AC******
Installed easily, truck fired right up with only a slight idle adjustment. My truck runs great. I would purchase again.
Reviewed in the United States on April 1, 2024 by amanda moorhouse
1975 Chevrolet 350 pickup. First off, I've been building carbs for 55 years. All Quadrajet carbs are pot metal castings, this is the FIRST aluminum casting I've seen. Very good quality made in China. I had to take the top off to see inside and I had to put my touch on the carb. There was an issue with the choke linkage fast idle cam portion, I had to replace with a used part that I had on hand. I also had to increase the jetting, the carb was to lean. Beside having to tweak the carb, the casting is well built. I would recommend to a gearhead.
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Reviewed in the United States on December 7, 2023 by Amazon Customer
Not installed yet but I disassembled to see differences from a real quadrajet. There’s some good and bad. Machining tolerances and assembly could cause some issues. I will be comparing with a 1985/6 factory Quadrajet with the dual capacity accelerator pump I own which looks like this new casting is based on. The Good: Lighter than factory. Outside assembled well, linkages correct and no stripped or loose screws. It has the correct geometry throttle bell crank if connecting to TV cable for OD trans. Proper electric choke body, although there is machined hole it is not connected to vacuum circuit. It was clean! LoL I’m sick of cleaning used quadrajets. Large windowed needle seat. Bad: Upon disassembly I was welcomed with a torn gasket in middle near the secondary rods. The torn gasket material was laying in the fuel bowl was about 1cm and could definitely cause a clog. New gasket 1250 air horn gasket, 1350 body, better flange gaskets with nylon bolt holes are available. Comparing the 1985/6 carb airhorn to the new I noticed there was no machined passage for the front vent. This would connect to charcoal canister if equipped. The airhorn has a false aneroid cavity where the solenoid would be on the 1985/6 carb. The gasket and washer just barely enough to cover. If say the gasket warps or cracks dirt can get into fuel system as there is also not an aneroid cavity insert under in the carb body. Machine the acorn cover would have been better since the 1985/6 solenoid won't fit due to the bottom of cavity in the body not having the base or plunger. Gasket failure in the fuel filter inlet. The gasket felt more pliable than others I have seen. The fuel filter housing has more of chamfer ridge where the filter sits than 1985/6 factory. The fuel filter inlet also had a strong solvent smell and coating Secondary lock out lever would not engage fully without filing down material. It could potentially bind the secondaries between startups. Secondary lockout lever prevents the secondary throttle blade from opening until engine is warmed up and choke is open. The 1985/6 factory lever would engage but due to design difference in the secondary lockout pin there was enough slack to move secondary’s while choke closed. Power piston retained with a metal ring instead of nylon bushing. Hard to remove, rebuild kits will have a nylon bushing. The power piston was also missing primary metering rods retaining spring. Tiny Spring/hanger for fuel needle was missing. It is a windowed large orifice needle seat my guess between .130-135 Blocked idle bypass air in body. Not plugged will need to drill out. The Q-Jet uses an idle air bleed system that allows idle air to be pulled into the intake just below the throttle blades. By allowing a controlled amount of air to bypass the throttle blades, the throttle blade opening can be decreased, allowing effective use of the transition slots in the throttle plate. Plugging the holes for the idle air bleed results in the idle speed screw needing to be cranked up to the point that the transition slots are excessively exposed, causing off-idle stumble and hesitation. Gasket on electric choke coil. This will block the grounding circuit. Questionable: 2.67" long accelerator pump. The 1985/6 carb had shorter style 2.57" long. It is a shorter style assembly that is great for performance applications. This provides a quicker fuel shot for better acceleration. Fuel filter was non-check valve type. Combined with the windowed needle seat fuel may drain back into line/pump and car may be harder to start with less fuel in bowl. Will have good fuel flow for race applications. Missing aneroid cavity insert. Again questionable some carbs come without from factory. Will increase fuel bowl volume which good, but can introduce slosh turning hard braking and cornering. Couldn't find calipers to measeure rods. Secondary's are richer than CH rods, Hanger higher than J, i don't have primary rods to compare.
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Reviewed in the United States on March 7, 2022 by trainwrecktony trainwrecktony
Save your money. By the time I was able to install this, it was past the return and I’m stuck with an expensive paperweight. The fuel return port blew out and poured fuel everywhere. I’m am lucky it didn’t start before that or my car could have been a total loss.
Reviewed in the United States on July 19, 2024 by Amazon Customer