Author Topic: 78 W72 Quadrajet  (Read 194 times)

BanditRich

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78 W72 Quadrajet
« on: December 29, 2017, 06:12:22 PM »
I have had my TA for 15 yrs now and all this time it has had an Edelbrock Performer carb on it. To my utter horror and sadness when I ran the # on it - 1406 - I found out it is only a 600 cfm.  :-(
The original owner had the engine rebuilt and put this in with the Performer intake and cam. I  think it was unwittingly done -  thinking this carb would be more powerful than the factory unit.
Needless to say I haven't been too happy about that.
I have just snagged the one that belongs on my TA fresh out of rebuild with Cliff Ruggle's kit with the ethanol resistant float etc.
My previous TA that I had in the early 90's - a 77 SE - had the W72 engine unchanged from new.
My memory of how everything was hooked up is pretty foggy all these years later so I dove into my mountain of old HPP mags and found a couple pics of a 78 W72 with the air cleaner off trying to refresh my memory.
I can see how the throttle cable & the kickdown cable are hooked onto the carb. There are 3 things I can't clearly see though-
1. What is the cable with the white plastic tube on the end of it that's hooked up on the outside part of the linkage right beside the throttle cable? This cable isn't on my car right now with the Performer carb. What is that & do I need it for the carb to work properly?
2. Could someone put up a pic or 2 clearly showing where both ends of throttle return spring hook up? The pics I am looking at in my old HPPs don't clearly show this.
3. I'm going to hook up the charcoal canister when the Quadrajet goes in its rightful place.
Which ports hook up to the carb, and which ones hook up to the vapor return lines? The one on the driver side & the one on the passenger side?


BLACK Y88 - W72/WS6                                     
Bird Of The Month - August 2004                          
"What's a Texas county mountie doing in Arkansas? Well let's see what he's got under the hood! Bye, bye baby!
Mass Firebirds -
https://www.facebook.com/groups/906060559415396/
http://www.allgentransams.com/members_pages/mf/april2010.html

Aus78Formula

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Re: 78 W72 Quadrajet
« Reply #1 on: December 29, 2017, 08:29:01 PM »
Good chance that you won't see any performance increase if it was set up correctly, but that's enough of a reason not to swap it in first place.
Have you still got the clear emissions and vacuum line transfer on radiator support?

BanditRich

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Re: 78 W72 Quadrajet
« Reply #2 on: December 29, 2017, 11:13:27 PM »
Yes I do.
BLACK Y88 - W72/WS6                                     
Bird Of The Month - August 2004                          
"What's a Texas county mountie doing in Arkansas? Well let's see what he's got under the hood! Bye, bye baby!
Mass Firebirds -
https://www.facebook.com/groups/906060559415396/
http://www.allgentransams.com/members_pages/mf/april2010.html

aussieta

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Re: 78 W72 Quadrajet
« Reply #3 on: December 30, 2017, 03:27:40 PM »
1978 Y84 W72 WS6

BanditRich

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Re: 78 W72 Quadrajet
« Reply #4 on: December 30, 2017, 08:18:56 PM »
Thank you!  :D
BLACK Y88 - W72/WS6                                     
Bird Of The Month - August 2004                          
"What's a Texas county mountie doing in Arkansas? Well let's see what he's got under the hood! Bye, bye baby!
Mass Firebirds -
https://www.facebook.com/groups/906060559415396/
http://www.allgentransams.com/members_pages/mf/april2010.html

Re: 78 W72 Quadrajet
« Reply #4 on: December 30, 2017, 08:18:56 PM »