rochester quadrajet to edelbrok 1406 carb replacement for 1989 Cadillac Brougham
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RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, rochester quadrajet to edelbrok 1406 carb replacement for 1989 Cadillac Brougham in Past Cadillac Vehicle Discussion; I just got a Edelbrok 1406 Carb for my 1989 Cadillac Brougham. My stock carb isn't running and for the ...
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    smacktime's Avatar
    smacktime is offline Cadillac Owners Member
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    rochester quadrajet to edelbrok 1406 carb replacement for 1989 Cadillac Brougham

    I just got a Edelbrok 1406 Carb for my 1989 Cadillac Brougham. My stock carb isn't running and for the time being I have a 1406 Edelbrok laying around I want to install until I have enough money to get the original carb redone. Have anyone done this install? Is it direct bolt on and how much adjustments do i have to make. Any accessories I need to have and does it make a difference if the TPS is installed. I heard if the quadrajet is removed I might as well remove and replace the stock dizzy also since the stock carb and dizzy are the only computer controlled components for the engine. Thanks everyone!

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    cadillac_al is online now Cadillac Owners Connoisseur
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    Re: rochester quadrajet to edelbrok 1406 carb replacement for 1989 Cadillac Brougham

    I never know which ones have 307's or 305's but Edelbrock carbs do interfere with the Olds EGR valve. I adjusted mine with a hammer but if you want the EGR you may need a carb spacer and hope you have hood clearance. The 1406 is the fuel mileage leaned out carb that gives Edelbrock carbs a bad rap. If you have it you might as well use it. Good luck. If yours is a 305 it will be no problem.

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    jayoldschool is online now GM RWD V8 addict
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    Re: rochester quadrajet to edelbrok 1406 carb replacement for 1989 Cadillac Brougham

    He has a 307 Olds. It's not a bolt on (and wouldn't be on a Chev 305, either). The 1406 is a square bore carb, the Quadrajet is spread bore with small primaries and huge secondaries. The 1406 is just a 1405 with electric choke added. I have a 1405 on my 71 Pontiac which runs a 350 Chevy. The 1406 will not bolt on your intake without a restrictive adapter.

    Three options:
    - use the adapter
    - change the intake
    - get a Quadrajet

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    cadillac_al is online now Cadillac Owners Connoisseur
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    Re: rochester quadrajet to edelbrok 1406 carb replacement for 1989 Cadillac Brougham

    Well Shizayem, my brain wasn't firing on all 8 this morning. You can't forget the restrictive looking adapter. The Edelbrock carb has a dual bolt pattern but the butterflies don't fit in the stock intake holes. I always said those adapters looked pretty restrictive but after using them, they didn't seem to be holding anything back. It still wouldn't clear a 350 Olds EGR valve with the adapter.

    I posted last year that the Edelbrock carb I put on my Seville made that car more powerful than it has ever been in the last 10 years at least. The same E carb on a 69 GTO seemed to be more powerful than the stock Q jet, although they were both almost perfect. The stock GTO Qjet worked about the same as the E carb on my Seville; much more power than the last carb, and I thought that one was perfect. I am now on a mission to rebuild a Q-jet that can equal my E carb.

    At least Jay straightened us out before you had a chance to take your car apart. Peace.

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    Quote Originally Posted by cadillac_al
    Well Shizayem, my brain wasn't firing on all 8 this morning. You can't forget the restrictive looking adapter. The Edelbrock carb has a dual bolt pattern but the butterflies don't fit in the stock intake holes. I always said those adapters looked pretty restrictive but after using them, they didn't seem to be holding anything back. It still wouldn't clear a 350 Olds EGR valve with the adapter.

    I posted last year that the Edelbrock carb I put on my Seville made that car more powerful than it has ever been in the last 10 years at least. The same E carb on a 69 GTO seemed to be more powerful than the stock Q jet, although they were both almost perfect. The stock GTO Qjet worked about the same as the E carb on my Seville; much more power than the last carb, and I thought that one was perfect. I am now on a mission to rebuild a Q-jet that can equal my E carb.

    At least Jay straightened us out before you had a chance to take your car apart. Peace.
    I'm confused....you said it works better than the stock Qjet, but its also the carb that gave edelbrock a bad rap because it was too lean. Did you make it run richer, or did it work ok in stock form?

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    Re: rochester quadrajet to edelbrok 1406 carb replacement for 1989 Cadillac Brougham

    Thanks... So I have the carb bolted on, and the car runs. What else do I need to attach the cruise control and transmission cable linkage to the carb?

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    Re: rochester quadrajet to edelbrok 1406 carb replacement for 1989 Cadillac Brougham

    Edelbrock has the linkage adapters. Just check on Summit/Jegs/Edlebrock/whatever.

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    Re: rochester quadrajet to edelbrok 1406 carb replacement for 1989 Cadillac Brougham

    Quote Originally Posted by cadillac kevin View Post
    I'm confused....you said it works better than the stock Qjet, but its also the carb that gave edelbrock a bad rap because it was too lean. Did you make it run richer, or did it work ok in stock form?
    Yeah, mine isn't a 1406, it's the marine carb 1409 or 1411? It's jetted richer than the 1406. I have a couple 1406's on the shelf because they were dogs. I just need to spend some time with those and richen them up I guess. I think they were meant for 305's and fuel economy.

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    smacktime's Avatar
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    Re: rochester quadrajet to edelbrok 1406 carb replacement for 1989 Cadillac Brougham

    Theres more than one bracket to choose from. I called Edelbrock and the technician said to use p/n# 1484 which is the cruise control kit.

    The box it came in said to use 8030 or 8031. I looked up both parts and 8031 is actually made for GM vehicles. The part description says: This bracket was designed to fit Chevy small-block applications that use square-peg throttle/kick-down/cruise-control cable assemblies.

    I am not really sure which bracket to get.

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