hello. i would like to know if anyone here has any experience with a rochester dual jet carb. looks like a quadrajet, but secondaries are blank.
i have a offy 4bbl intake and this carb on hand and would like to use them together to avoid buying new stuff to save some $$$. also it has an automatic choke. thanks, Andy.

I say give it a try. GM put these on millions of small V8 and V6 engines and as far as I know is known to be relatively reliable. This should also open up a lot of options for which air cleaner you can run. Let us know how it works out.

Scott M

i dont know anything but where in indiana are you? theres a handful of us in indy, bbq coming up sometime soonish.

I take it the Rochester is a spreadbore base. Do you have a spreadbore adapter plate on the Offy, or were you going to use a second adapter on top?
The 4bbl offy plate is normally for a square pattern. (Holley, Edelbrock/Carter.) I saw scads of Carter's at the Woodburn Mopar Nats while walking through the swap meet with Mike yesterday. $25-$50 for 500 and 600 cfm cores. Lot's of TQ's too.

Watch the overall height if you use two adapters. Nothing like an air cleaner stud dimple in your hood.

CJ

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Part of Tyrde-Browne Racing

The dualjet is a 2bl. It looks just like a 4bl quadrajet, but the area for the secondaries is closed off in the casting.

yes, this is a two barrel carb that looks just like a quadrajet with no secondaries. spread bore design, will have to get an adapter plate, no biggie there. this will be put on a stock 225 truck with about 140000 miles. the quadrajets were (are) good carbs when set up correctly and i would expect the "dual jet" to be a dependable unit as well. the only problem is i will have to give my son my offy intake. oh, well, i guess i will just have to get a hurricane intake for mine. i guess i will just have to live with that. it will be tough. thanks for the replies. this forum is the best, people actually reply with useful information. how unique. i will be making a donation soon. andy.

You can remove the Offy adapterand modify a spreadbore adapter to fit. that way you wouldn't worry about height. On a regular 4bbl spreadbore you would need to hog out the manifold for the massive secondaries.

I see you are in a truck. Height? No problemo!

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'72 Duster 198 stock cam, 3:23's Hookers on jack stands for 8 years in the driveway
'79 Maxivan 360 Offy Qjet Comp RV cam/rusting in the driveway.
93 D350 160HP Cummins Auto Dually Clubcab needs a injector pump
2005 Golden Couch Buick

i am going to try the dualjet, but first need to get a new exhaust manifold. will post later with results. does anyone know if the electric choke conversion for a quadrajet will fit this? i am in columbus, in. love to know when you plan the bbq Andy's GT! if my wallet allows, i will have both my and my sons truck finished soon. andy.

CJ,

Did you see any Offy #6264 spread bore adapters for a Holley 4360 to a Offy/Weiand manifold?

It is the one with little back barrels but still off set like the Q-jet.

Let me know so I can do the swap.

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Aggressive Ted

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74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG