Holly vs Rochester
December 26th, 2009, 11:08 AM
#1
79Cutlass260cid
Thread Starter
Join Date: Aug 2008
Location: Coos Bay, OR
Posts: 2
Holly vs Rochester
Some while back I was looking for an answer to my Carburetion problems. I had just installed a rebuilt stock Rochester. I could find no one that could 100 percent get it right. Finally I found an Old Carb Mechanic that refused to work on it and told me to swap the reject (Rochester) for a Holly 350 cfm and plug the emmisions ports except the PCV.
Has anyone tried something like this and if so what did you do about getting the choke correctly connected and adjusted as this is the only reason I'd do the swap since the car starts and runs fine now, that I know not to tap the gas pedel all the way to the floor before turning the key.
Has anyone tried something like this and if so what did you do about getting the choke correctly connected and adjusted as this is the only reason I'd do the swap since the car starts and runs fine now, that I know not to tap the gas pedel all the way to the floor before turning the key.
Last edited by qmcdugan; December 26th, 2009 at 05:50 PM.
December 26th, 2009, 11:33 AM
#2
Old(s) Fart
Join Date: Mar 2007
Location: Northern VA
Posts: 47,700
Some while back I was looking for an answer to my Carburetion problems. I had just installed a rebuilt stock Rochester. I could find no one that could 100 percent get it right. Finally I found an Old Carb Mechanic that refused to work on it and told me to swap the reject (Rochester) for a Holly 350 cfm and plug the emmisions ports except the PCV.
Has anyone tried something like this and if so what did you do about getting the choke correctly connected and adjusted as this is the only reason I'd do the swap since the car starts runs fine now that I know not to tap the gas pedel all the way to the floor before turning the key.
Has anyone tried something like this and if so what did you do about getting the choke correctly connected and adjusted as this is the only reason I'd do the swap since the car starts runs fine now that I know not to tap the gas pedel all the way to the floor before turning the key.
December 26th, 2009, 11:47 AM
#3
Moderator
Join Date: Sep 2006
Location: Medford, Oregon
Posts: 13,770
Welcome to the site, another person from Southwestern Oregon! Yes, you will find most guys here are happy with Rochester caburators. There's at least one person here who has been rebuilding quadrajets and really knows his stuff. Please post more information and I'm sure we can get you some help. John
December 26th, 2009, 05:39 PM
#4
79Cutlass260cid
Thread Starter
Join Date: Aug 2008
Location: Coos Bay, OR
Posts: 2
1979 vin F, gasoline, stock 260cid V8 with all emmisions pieces inplace and fucntioning. The carb is the Rochester 17059150 M2MC (Thermostate / Choke gets warm air from intake manifold).
Olds260Emmisionrouting.jpg
79OldsRochesterDualjet-210a.jpg
Olds260Emmisionrouting.jpg
79OldsRochesterDualjet-210a.jpg
Last edited by qmcdugan; December 26th, 2009 at 05:46 PM.
December 26th, 2009, 06:13 PM
#5
Registered User
Join Date: Sep 2009
Location: KY
Posts: 1,489
The two barrel Rochester from the late 70's is a pretty reliable carb. My first question is did replace the gasket that's between the carb and intake. Also you would want to check the vacuum lines to make sure they are good.
December 29th, 2009, 08:55 AM
#10
Old(s) Fart
Join Date: Mar 2007
Location: Northern VA
Posts: 47,700
December 29th, 2009, 10:37 AM
#11
Registered User
Join Date: Mar 2008
Posts: 3,860
OK, I just saw the info on his summary. You would need an adapter to put the Holley onto his manifold, right? Setting up a Dual Jet is no harder than a Quadrajet. A competent shop should have no trouble with it. Also, the air cleaner "mouth" would be different, so that is another hassle and expense from trying to put on a Holley.
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