Just curious, are they any good for modifying? Such as jetting for optimum economy?
2bbl rochesters any good for performance?
- Thread starter daves66nova
- Start date
- Status
What is the application?
71 350 Elco, headers and intake
They might help with economy some, but my experience from back in the 60's and 70's was you would get better economy from a Rochester or Carter 4bbl as long as you just used the first two barrels. With your headers and other modifications I believe the 2bbl would hurt your high end performance.
The reason I asked what application is that the Rochester 2bbl's worked great on straight sixes and flat head Ford V-8's.
The reason I asked what application is that the Rochester 2bbl's worked great on straight sixes and flat head Ford V-8's.
Last edited:
This would be strictly for mileage . The headers and intake i added on for "breatheability".Max rpm I'm shooting for would probably be around 4000rpm.
As long as you don't care about total performance and you understand the limits of a 2bbs, it will work. Don't know your age or experience, but would highly recommend you find a good old school mechanic or speed shop in the LA area. There should be plenty of them out there.
I was thinking of using my wide-band meter to do changes with. So, there are different sized jets still available for this carb?
Right now it has the 2bbl "rottenchester"
Yea if you have three of them (tri-power)
Just kidding.
Rochester model 2GC?
I suppose you could make it work. There are better flowing 2bbl's out there. Holley used to make one, then there is the rochester 2bbl that is basically the primarys from a 4MV Q-Jet. It was used in the late 70's and early 80's.
Just kidding.
Rochester model 2GC?
I suppose you could make it work. There are better flowing 2bbl's out there. Holley used to make one, then there is the rochester 2bbl that is basically the primarys from a 4MV Q-Jet. It was used in the late 70's and early 80's.
Originally Posted By: JetStar
then there is the rochester 2bbl that is basically the primarys from a 4MV Q-Jet. It was used in the late 70's and early 80's.
First one fooled me. From the outside it looks exactly like a Qjet, until you notice there is no secondaries or secondary linkage on it. It was on a wonderful Pontiac 301.
then there is the rochester 2bbl that is basically the primarys from a 4MV Q-Jet. It was used in the late 70's and early 80's.
First one fooled me. From the outside it looks exactly like a Qjet, until you notice there is no secondaries or secondary linkage on it. It was on a wonderful Pontiac 301.
Originally Posted By: JetStar
Yea if you have three of them (tri-power)
That's the first thing that I thought of too.
Yea if you have three of them (tri-power)
That's the first thing that I thought of too.
I cant remember where I saw it but there were a few models that got better MPG with the 4brl than the 2. This is because the primaries in the quadrajet are as small as in the 2 brl. This bears out in that GM stopped offering 2 brls durring the twilight of the carburated V8.
Get a hold of Doug Roe's book on Rochester carburetors. It is a massive tome concerning every aspect of the Quadrajet.
Are Qjets any good? Yes! Very versatile. Very adjustable.
Almost any fuel injection is better, but as far as carbs go, the Qjet is the highest evolution.
Are Qjets any good? Yes! Very versatile. Very adjustable.
Almost any fuel injection is better, but as far as carbs go, the Qjet is the highest evolution.
Originally Posted By: mechtech2
Get a hold of Doug Roe's book on Rochester carburetors. It is a massive tome concerning every aspect of the Quadrajet.
Are Qjets any good? Yes! Very versatile. Very adjustable.
Almost any fuel injection is better, but as far as carbs go, the Qjet is the highest evolution.
I like them better than Holley.
Get a hold of Doug Roe's book on Rochester carburetors. It is a massive tome concerning every aspect of the Quadrajet.
Are Qjets any good? Yes! Very versatile. Very adjustable.
Almost any fuel injection is better, but as far as carbs go, the Qjet is the highest evolution.
I like them better than Holley.
Originally Posted By: mechtech2
Get a hold of Doug Roe's book on Rochester carburetors. It is a massive tome concerning every aspect of the Quadrajet.
Are Qjets any good? Yes! Very versatile. Very adjustable.
Almost any fuel injection is better, but as far as carbs go, the Qjet is the highest evolution.
That is probably their biggest criticism. They are very adjustable (complicated) and most people can't tune them well. Holley products are popular because they are simple and people get them to run decent.
Get a hold of Doug Roe's book on Rochester carburetors. It is a massive tome concerning every aspect of the Quadrajet.
Are Qjets any good? Yes! Very versatile. Very adjustable.
Almost any fuel injection is better, but as far as carbs go, the Qjet is the highest evolution.
That is probably their biggest criticism. They are very adjustable (complicated) and most people can't tune them well. Holley products are popular because they are simple and people get them to run decent.
OVERKILL
$100 Site Donor 2021
Originally Posted By: mechtech2
Get a hold of Doug Roe's book on Rochester carburetors. It is a massive tome concerning every aspect of the Quadrajet.
Are Qjets any good? Yes! Very versatile. Very adjustable.
Almost any fuel injection is better, but as far as carbs go, the Qjet is the highest evolution.
Is the Qjet available with 4-corner adjustment? If not, then it is not the highest evolution. There are a number of higher-end carbs that offer this feature...
Get a hold of Doug Roe's book on Rochester carburetors. It is a massive tome concerning every aspect of the Quadrajet.
Are Qjets any good? Yes! Very versatile. Very adjustable.
Almost any fuel injection is better, but as far as carbs go, the Qjet is the highest evolution.
Is the Qjet available with 4-corner adjustment? If not, then it is not the highest evolution. There are a number of higher-end carbs that offer this feature...
4 corner adjustment?
In a sense, of course. But do you mean idle adjustment capabilities?
In a sense, of course. But do you mean idle adjustment capabilities?
OVERKILL
$100 Site Donor 2021
Originally Posted By: mechtech2
4 corner adjustment?
In a sense, of course. But do you mean idle adjustment capabilities?
I mean 4-corner enrichment adjustment. But yes, the 4-corner idle adjustment as well is a neat feature.
I don't know a lot about Q-jets, which is why I ask.
4 corner adjustment?
In a sense, of course. But do you mean idle adjustment capabilities?
I mean 4-corner enrichment adjustment. But yes, the 4-corner idle adjustment as well is a neat feature.
I don't know a lot about Q-jets, which is why I ask.
Last edited by a moderator:
- Status
