Power/HP
Thread Starter
3rd Gear
Joined: Mar 2008
Posts: 3
Likes: 0
Power/HP
Hi,
I just installed a edlebrock cam and manafold performer kit,and Headman headers on my stock 75 350.It still not jumping like I want it too.I have a Rochester 600cfm 4 barrel .I was thinking of replacing it with a Holly 4 barrel 600 cfm.I was told the Holly is better.Any opinions?...
thanks John 75
I just installed a edlebrock cam and manafold performer kit,and Headman headers on my stock 75 350.It still not jumping like I want it too.I have a Rochester 600cfm 4 barrel .I was thinking of replacing it with a Holly 4 barrel 600 cfm.I was told the Holly is better.Any opinions?...
thanks John 75
Drifting
Joined: Sep 2004
Posts: 1,959
Likes: 1
From: North Bend Ohio
They never made such a thing. All Quadrajets were 750 or 800 CFM with the exception of some 80's small engine smog carbs that had limiters in the air valve opening. Even these limiters could be removed to restore the 750 rating.
If this carburetor is of stock calibration it will now be very lean. What is the jet/rod combo? How is the ignition set up? Tuning what you have will be much less expensive than buying new equipment.
BigBlockk
Later.....
If this carburetor is of stock calibration it will now be very lean. What is the jet/rod combo? How is the ignition set up? Tuning what you have will be much less expensive than buying new equipment.
BigBlockk
Later.....
Drifting
Joined: Sep 2004
Posts: 1,959
Likes: 1
From: North Bend Ohio
Holley makes generic stuff. You could get one for a few hundred dollars that would be a little closer than the Quadrajet. Or, you could open up the Rochester and see what the tune up is in it. You would be surprised what adding a couple of jet sizes can do. You can get a rebuild kit for under $50. Jets are about $10.
It's up to you. Do you just want to just slap substandard parts on it or do you want to be a hot rodder.
BigBlockk
Later.....
It's up to you. Do you just want to just slap substandard parts on it or do you want to be a hot rodder.
BigBlockk
Later.....
Drifting
Joined: Apr 2007
Posts: 1,970
Likes: 45
From: Cameron Park CA
Even if you bought a Holley, out of the box it probably won't be tuned properly for your car/engine. So you'd have to go through the same process as with the Q-Jet. Might as well save your money, stay with what you have and get it running like it should. And I have a Holley on mine.
Cheers,
Pete
Cheers,
Pete
Intermediate
Joined: Nov 2006
Posts: 47
Likes: 0
From: Orlando Florida
i have a 74 with a big block. i had the stock heads ported and a 3 angle valve job. new torquer 2 manifold and a holley 750 with roller rockers. it feels like a whole new car. im glad i didnt get all crazy with a cam and all that for now this is perfect. and i didnt even tune the carb out of the box....i will probably benifit from it but it runs great for now
Pro
Joined: Feb 2004
Posts: 564
Likes: 0
From: Pittsburgh PA
Hi,
I just installed a edlebrock cam and manafold performer kit,and Headman headers on my stock 75 350.It still not jumping like I want it too.I have a Rochester 600cfm 4 barrel .I was thinking of replacing it with a Holly 4 barrel 600 cfm.I was told the Holly is better.Any opinions?...
thanks John 75
I just installed a edlebrock cam and manafold performer kit,and Headman headers on my stock 75 350.It still not jumping like I want it too.I have a Rochester 600cfm 4 barrel .I was thinking of replacing it with a Holly 4 barrel 600 cfm.I was told the Holly is better.Any opinions?...
thanks John 75
The other aspect to look at is the exhaust... No matter how much air can pull in, if you can't get rid of the exhaust, you'll be no further ahead then where you are now...
JMHO.
