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Username Post: Best upgrade carb for a stock 1973 250 4.1?        (Topic#372776)
mean60impalagene 
Contributor
Posts: 235

Reg: 01-31-13
03-18-23 10:20 AM - Post#2855899    

Has anyone changed the carb from thee mono carb to an upgrade?



 


Tony1963 
Frequent Contributor
Posts: 2448

Loc: Orlando Florida
Reg: 07-09-18
03-18-23 03:35 PM - Post#2855903    
    In response to mean60impalagene

If you are running three Monojets, that's a considerable upgrade from the factory setup. The engine can definitely pull in more air as you have tripled the intake capacity.

I see going any other route as a waste. Be sure that you have a free flowing enough exhaust to be able to handle the additional intake airflow.

People fear change because it threatens what they know, or what they claim to know.


 
bobb 
Super Senior Member
Posts: 6920

Loc: paradise
Reg: 09-05-03
03-19-23 11:28 AM - Post#2855925    
    In response to mean60impalagene

ive heard of holley weber 2 barrel conversions. you wont get tons of power out of that engine. i would do a compression test, better yet a cylinder leakdown test and cam inspection before spending any money on it.

70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails.


 
Tony1963 
Frequent Contributor
Posts: 2448

Loc: Orlando Florida
Reg: 07-09-18
03-19-23 12:00 PM - Post#2855930    
    In response to bobb

That's a great point. That engine was never known as a horsepower giant, but that little inline six made enough torque to move each of the Chevrolet vehicles (except Corvette) over its lifetime as the base engine.

Perhaps it is best served in its stock configuration?

People fear change because it threatens what they know, or what they claim to know.


 
mean60impalagene 
Contributor
Posts: 235

Reg: 01-31-13
03-20-23 07:24 PM - Post#2855984    
    In response to bobb

I have a machined 73 250 4.1 engine that I what to get a better carb. on it. I only want one carb not three.... It is going with a auto trans.



 
Tony1963 
Frequent Contributor
Posts: 2448

Loc: Orlando Florida
Reg: 07-09-18
03-21-23 01:41 AM - Post#2855987    
    In response to mean60impalagene

Ah...ok. Understood.

Adding a carburetor might not be the answer to additional horsepower. But, you could source an old Dualjet which is a Rochester 2-bbl carburetor from the 60s/70s that might help.

However, make sure that your carburetor is sized for your engine. Using a Dualjet from a V8 without modifications will only make it run badly.

Remember, the factory used the Monojet on these and they ran quite well.

People fear change because it threatens what they know, or what they claim to know.


 
Tony1963 
Frequent Contributor
Posts: 2448

Loc: Orlando Florida
Reg: 07-09-18
03-21-23 11:47 AM - Post#2856000    
    In response to mean60impalagene

Another carburetor to consider for GM vehicles is the Varajet which is essentially a staged 2-bbl carburetor. Think of it as a Quadrajet concept with only one side, one primary and one secondary.

https://nationalcarbureto rs.com/Chevrolet-GMC-Truc...

People fear change because it threatens what they know, or what they claim to know.


 
Stinky 
Senior Member
Posts: 1975

Loc: Whitewater, CO
Reg: 05-25-01
03-23-23 08:08 PM - Post#2856071    
    In response to Tony1963

How about fuel injection?

Holley makes 1 bbl, 2 bbl (of at least 2 dif types, and big FI units....towards the bottom of the page.

https://www.holley.com/products/fuel_systems /fuel_...



 
Tony1963 
Frequent Contributor
Posts: 2448

Loc: Orlando Florida
Reg: 07-09-18
03-24-23 01:57 PM - Post#2856085    
    In response to Stinky

Yes, I agree that fuel injection would be a great upgrade. I was getting the idea that he wanted to stick with a carburetor so I offered that as an option.

People fear change because it threatens what they know, or what they claim to know.


 


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