Questions about quadrajet applications
Thread Starter
Pro
Joined: Nov 2005
Posts: 609
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From: Ontario
Questions about quadrajet applications
I searched the archives and I can't seem to find the answers to my questions.
I looking for a quadrajet to put on my '69 350(stock build) with 4 speed.
I'm not real concerned with date codes as this is a NOM car.
I was looking a a quad off of an 1980 vette and wonder is there are any problems running it on the older engine?
Also if a quad is stamped with a 6 indicating it came off a car with an automatic, are there any issues running it on a manual? What's the difference in the carbs between manual and automatic?
TIA
Dave
I looking for a quadrajet to put on my '69 350(stock build) with 4 speed.
I'm not real concerned with date codes as this is a NOM car.
I was looking a a quad off of an 1980 vette and wonder is there are any problems running it on the older engine?
Also if a quad is stamped with a 6 indicating it came off a car with an automatic, are there any issues running it on a manual? What's the difference in the carbs between manual and automatic?
TIA
Dave
Safety Car
Joined: Dec 2004
Posts: 4,071
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From: San Diego CA
First off I'll say to get a q-jet from a '75 or earlier Vette. Parts are easier to come by for those. Second, a q-jet is NEVER plug and play they must all be tuned for every car they're put on. Tuning it isn't really that hard, either. A simple jet and rod change is usually all it takes to tune it in right.
Racer
Joined: Feb 2001
Posts: 405
Likes: 15
From: Minneapolis
An '80 Q-Jet should bolt right on. The only difference is that you'll need to plug the vacuum source for the automatic modulator, and you'll have an extra stud on the linkage where the kickdown cable normally attaches, which you can remove.
As far as tuning goes, you may have to do some tweaking, but perhaps not. When I bumped the HP of my mill, all I had to do was richen up the idle jets to match the cam and compression changes.
Not a diffcult prospect. I'd do it in a heartbeat.
As far as tuning goes, you may have to do some tweaking, but perhaps not. When I bumped the HP of my mill, all I had to do was richen up the idle jets to match the cam and compression changes.
Not a diffcult prospect. I'd do it in a heartbeat.
Melting Slicks
Joined: Mar 2006
Posts: 3,342
Likes: 7
From: Connecticut
Originally Posted by Kalway
First off I'll say to get a q-jet from a '75 or earlier
I have a ton of parts here and its amazing how many changes they have gone through from 66 to 74.
I would try to get as close to a 69 as possible
I could post pics of the differences from a 71 to 73.. theres alot to consider
I would certainly stay away from anything later than 1974
Thread Starter
Pro
Joined: Nov 2005
Posts: 609
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From: Ontario
Originally Posted by Bob Onit
As far as I know it would be pre 75, so a 75 is a no go.
I have a ton of parts here and its amazing how many changes they have gone through from 66 to 74.
I would try to get as close to a 69 as possible
I could post pics of the differences from a 71 to 73.. theres alot to consider
I would certainly stay away from anything later than 1974
I have a ton of parts here and its amazing how many changes they have gone through from 66 to 74.
I would try to get as close to a 69 as possible
I could post pics of the differences from a 71 to 73.. theres alot to consider
I would certainly stay away from anything later than 1974
If you would post some pics that would be great!
I have located a Quadrajet from a 69 350/350 that I was looking at, however I was wanting to go with an electric choke setup, is there a conversion for this?
Thanks.
Dave
Melting Slicks
Joined: Mar 2006
Posts: 3,342
Likes: 7
From: Connecticut
Originally Posted by 1mollyd
Bob Onit,
If you would post some pics that would be great!
I have located a Quadrajet from a 69 350/350 that I was looking at, however I was wanting to go with an electric choke setup, is there a conversion for this?
Thanks.
Dave
If you would post some pics that would be great!
I have located a Quadrajet from a 69 350/350 that I was looking at, however I was wanting to go with an electric choke setup, is there a conversion for this?
Thanks.
Dave
Whats wrong with the stock divorced choke?
They work great.
There are conversion kits, not sure about 69 though
Theyre also about $50
Thread Starter
Pro
Joined: Nov 2005
Posts: 609
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From: Ontario
Originally Posted by Bob Onit
Yes I can but I have to wait till I get home from work to post them
Whats wrong with the stock divorced choke?
They work great.
There are conversion kits, not sure about 69 though
Theyre also about $50
Whats wrong with the stock divorced choke?
They work great.
There are conversion kits, not sure about 69 though
Theyre also about $50
I've heard that this will cause the choke to take a lot longer to pull off. No?
Thanks.
Dave
Melting Slicks
Joined: Mar 2006
Posts: 3,342
Likes: 7
From: Connecticut
Originally Posted by 1mollyd
I'm changing to a Performer manifold with the exhaust crossover blocked.
I've heard that this will cause the choke to take a lot longer to pull off. No?
Thanks.
Dave
I've heard that this will cause the choke to take a lot longer to pull off. No?
Thanks.
Dave
I have an Edelbrock Performer and it still works fine plus I dont drive my car after october, maybe early november so It doesnt really matter to me
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Melting Slicks
Joined: Mar 2006
Posts: 3,456
Likes: 102
From: Piedmont Va
St. Jude Donor '11-'12-'13,'19-'20
I have an Edelbrock Performer and it still works fine
Ditto...Performer 2101 and divorced choke works like a champ....My exhaust crossover is open however...
Drifting
Joined: Nov 2002
Posts: 1,665
Likes: 1
From: Ontario
My exhaust crossover is blocked and I converted to electric using this Edelbrock electric choke conversion kit. Fit on my stock QJet no problem. This is the third year I have had it and no problems. I powered it using the windshield wiper +hot wire.
www.summitracing.com
Part Number: EDL-1932
$32.88
www.summitracing.com
Part Number: EDL-1932
$32.88
Melting Slicks
Joined: Mar 2006
Posts: 3,342
Likes: 7
From: Connecticut
Originally Posted by Boofers
My exhaust crossover is blocked and I converted to electric using this Edelbrock electric choke conversion kit. Fit on my stock QJet no problem. This is the third year I have had it and no problems. I powered it using the windshield wiper +hot wire.
Safety Car
Joined: Dec 2004
Posts: 4,071
Likes: 0
From: San Diego CA
Originally Posted by Bob Onit
As far as I know it would be pre 75, so a 75 is a no go.
I have a ton of parts here and its amazing how many changes they have gone through from 66 to 74.
I would try to get as close to a 69 as possible
I could post pics of the differences from a 71 to 73.. theres alot to consider
I would certainly stay away from anything later than 1974
I have a ton of parts here and its amazing how many changes they have gone through from 66 to 74.
I would try to get as close to a 69 as possible
I could post pics of the differences from a 71 to 73.. theres alot to consider
I would certainly stay away from anything later than 1974
But ya, a 4MV (earlier model q-jet) is ideal because you can get the correct metering rods either from edelbrock or carburetion.com. The M4M (later model q-jets) only has the fatty M rods available new now and they make you run super lean at WOT. I believe JJ's smoking deals is all out of late model metering rods now, too. That's where I got like 5 pairs of rods for my M4M. I always stress people get the earlier model q-jets because of this.
I also say go for the electric choke conversion, it's easy to do and they're quite reliable. Of course during the summer it's sort of annoying, if you set it during the winter, because it'll close too far and make it all uber rich at startup. I had to tinker with mine to make it knock that off.
Melting Slicks
Joined: Mar 2006
Posts: 3,342
Likes: 7
From: Connecticut
I beleive the change came in 75
When I had asked Lars about a carb for my 73 he told me "Any passenger car QJ from 1971 to 1974 would work fine,
I have nothing left from POST 74.. I gave them all away..
I have Doug Roe's book here so I suppose I can open it up and try to confirm this
When I had asked Lars about a carb for my 73 he told me "Any passenger car QJ from 1971 to 1974 would work fine,
I have nothing left from POST 74.. I gave them all away..
I have Doug Roe's book here so I suppose I can open it up and try to confirm this
Safety Car
Joined: Dec 2004
Posts: 4,071
Likes: 0
From: San Diego CA
Originally Posted by Bob Onit
I beleive the change came in 75
When I had asked Lars about a carb for my 73 he told me "Any passenger car QJ from 1971 to 1974 would work fine,
I have nothing left from POST 74.. I gave them all away..
I have Doug Roe's book here so I suppose I can open it up and try to confirm this
When I had asked Lars about a carb for my 73 he told me "Any passenger car QJ from 1971 to 1974 would work fine,
I have nothing left from POST 74.. I gave them all away..
I have Doug Roe's book here so I suppose I can open it up and try to confirm this
Melting Slicks
Joined: Mar 2006
Posts: 3,342
Likes: 7
From: Connecticut
Originally Posted by Kalway
Does the doug roe book point out any major differences between the M4M and the 4MV besides the float level and metering rod length?
I think its a MUST HAVE if you want to learn about Rochester carbs.
Drifting
Joined: Nov 2002
Posts: 1,665
Likes: 1
From: Ontario
Originally Posted by Bob Onit
Did the 77's come with a hot air divorced choke from the factory?
Last edited by Boofers; Jul 31, 2006 at 11:53 AM.
