estimated, this product will be compatible with a mercruiser 4.3 engine series engine of007457?

I used one on a 93 GM -4.3 from a van by just removing the original intake and purchasing a new Edelbrock intake made for that engine . I used it in my street rod for a few years . Check with the Edelbrock company for more information .

Can you tell me what all the vacuum ports are for? It has more than a normal Qjet

Each car has a specific set of emission related vac requirements so best to refer to a manual

Is there any kind of tuning instructions?

No instructions but not that hard to tune. There are three screws on the brown round thing that you loosen and then adjust to tune.

Where are the directions? It has different jets and no directions on what the different ones are for or how to change

Take the top off the carburetor jets located inside. Unless you’re building a hot rod there is no need to change the jets. I put mine on a 454 motor in my RV and made a small adjustment in front of carburetor. My RV is 36 feet long.

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Rochester Quadrajet Carburetor 4 Barrel Fit Chevy 305-350 V8 Electric Choke | Restore GMC V8 Performance, Easier Starting, Fits GM Chevrolet Cadillac 1980-1989 305-350c.i 750CMF 1904R 1906R with Gaskets

Product ID: 445736170

Details

Brand
liriuda
Vehicle Service Type
Car Truck
Exterior Finish
Polished
Fuel Type
Gasoline
Recommended Uses For Product
Truck

🔋Electric choke for smooth starts

⏱️Vacuum secondary for responsive throttle

⚙️750 CFM airflow

€ 446.75

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚗 Upgrade your classic Chevy’s heart with precision power and flawless starts!

SEAMLESS COLD STARTS - Electric choke ensures hassle-free ignition every time
DIRECT OEM REPLACEMENT - Fits 1980-89 Chevy/GMC 305-350 c.i. engines with perfect compatibility
COMPLETE INSTALLATION KIT - Includes gaskets, plugs, jets & tool for a pro-level upgrade
DYNAMIC THROTTLE RESPONSE - Vacuum secondary boosts acceleration when you need it most
PRECISION 750 CFM AIRFLOW - Optimized fuel delivery for peak engine performance

This remanufactured Rochester Quadrajet 4MV carburetor delivers 750 CFM airflow with a vacuum secondary and electric choke, designed as a direct replacement for 1980-1989 GM Chevrolet and GMC 305-350 c.i. engines. It enhances throttle response and overall engine performance, comes with a full gasket and jet kit, and fits Chevy cars and trucks requiring part numbers 1904R or 1906R.

Specifications

Brand	liriuda
Vehicle Service Type	Car, Truck
Exterior Finish	Polished
Fuel Type	Gasoline
Recommended Uses For Product	Truck
Specific Uses For Product	Performance
Product Dimensions	7"D x 11"W x 13"H
OEM Part Number	1904R, 1906R
Manufacturer	LIRUIDA AUTO PARTS
UPC	747749037125
Model	1904, 1906
Item Weight	8.16 pounds
Country of Origin	China
Item model number	1904R, 1906R
Manufacturer Part Number	1904R, 1906R

Reviews

J**K

Great product

Fast shipping

13.04.2024

N**H

Kept flooding the car.

I bought this carb because it said new, but when I put it on, it kept flooding the car with fuel, no matter what I did. The car also spewed black smoke, because it was running too rich. I swapped out this carb for a used one and the car runs way better. I do not think this is a good replication of a Rochester Quardrajet. I can see why they're "currently unavailable", they're no good.

2.02.2025

M**4

Works well.

This is not made by Rochester. It is most likely a Chinese reproduction. It is a good reproduction. It seems to function as intended.

26.06.2024

R**E

Good

Easy

31.01.2023

F**K

Carburetor

Don’t run all that well even after adjusting so I put a different one on.

23.08.2024

B**7

Carb

Junk could not get it to work. Was flooding my new engine. Went to pick a part got a carb and a rebuild kit and worked first try so much for new.

27.12.2023

J**G

Carburetor

The media could not be loaded. I bought this carburetor 6 month ago and keeps leaking fuel from where the electric choke is idk why if the gaskets are to cheap or wasn’t assemble right

4.03.2023

A**R

CARB. HAD SOME PROBLEMS , BUT WAS REFUNDED MONEY WITH-OUT ANY PROBLEMS

HAD PROBLEM WITH PART BUT REFUND WAS DONE RIGHT A-WAY

15.11.2023

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€ 446.75

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Croatia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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1 week ago

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Customer service was outstanding when I had questions about the product.

2 days ago

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