Four barrel for 318?

Engines, Exhaust and Fuel Systems

  1. 78VOLAREWAG

    78VOLAREWAG Well-Known Member

    Messages:
    87
    Likes Received:
    21
    Joined:
    Nov 3, 2017
    Location:
    PITTSBURGH PA
    I picked up a complete @ 85 360 4 Barrel, I plan to rebuild at a later time. Any problems with putting the intake and Quadrajet on my 78 318? Kick down is not a problem, mine is a 4 speed. I does, however, use an electric choke on the 4 barrel, and the 318 uses a thermostat in the manifold. Any non expensive suggestions would be appreciated.
     
  2. CM360

    CM360 Well-Known Member

    Messages:
    254
    Likes Received:
    6
    Joined:
    Sep 18, 2011
    That Q jet is a dog. They can be tricked to run well just like the TQ but it costs $@$500.00. Chrysler went from the TQ to the Q jet, not any better. Try an aftermarket carb. The smog motors suffered from all sorts of emission issues. The carbs were the last stop to get emissions down. They all ran like dogs.
     
  3. Aspen500

    Aspen500 Well-Known Member

    Messages:
    3,906
    Likes Received:
    1102
    Joined:
    Feb 14, 2015
    Location:
    Rib Mountain (Wausau) WI
    A QJ can be made to work beautifully but it needs someone really good with them to get the right jets, metering rods, metering rod piston springs and hangers, etc.........A late buddy of mine (who died WAY too young) was a wizard with those things. Also depends on what model and year QJ.
    If you go with the QJ, all the electric choke needs is a keyed power source that's powered when the key is in "run". which can be found in the engine compartment. IIRC, the circuits with key on power have a dark blue wire.
     
  4. BudW

    BudW Moderator Staff Member

    Messages:
    3,592
    Likes Received:
    954
    Joined:
    Mar 4, 2012
    Location:
    Oklahoma City
    If I understand what you said, was you purchased an ’85 360 cast iron intake and the QJet that came off that vehicle?
    Did you also get the kickdown linkage/throttle cable from same vehicle?
    Did it come from a M-body, a pickup or a van?


    The ’84 and older 4-bbls were Carter Thermoquads – but Carter went out of business mid ’84. The ’85-89 Chrysler 4-bbls were all Rochester QuadraJet’s and all of them were computer controlled.

    If you are planning on not adding a computer – then I would highly recommend not using that carburetor. It takes a LOT of work to get that erm, ____ of a carburetor to function to any performance satisfaction. The same can be said with the computer controlled TQ’s. Once you remove the computer controls, they are just so rich in performance robbing emissions – they just don’t function well.

    The older TQ’s (’72-74’s) were Rockstar’s. Some ’75-76’s was good/some weren’t. Most all TQ’s made ’77-84 were not that good (needed work to perform).

    Getting back to your QJet, I’m not an expert on them and have only worked on less than 10 of 'em so my knowledge is weak. If a person can get the QJet baseplate to work on an older GM QJet (older than mid ‘70’s) – then you might have a great carb. I don’t even know if the baseplate (with Chrysler linkage) will even fit other QJet’s.

    Personally, I think you can spend less $ on getting a known good carburetor to begin with (just pick one) than what it will take to convert this one to work well. If you have a carburetor (or two) located – then post links here so we can give our opinions on it before paying for it.


    The ’79-84 360 cast iron intake is just like the ’85-89 version except the divorced choke provision is not machined. A person can get it machined, if wanted – but as mentioned earlier it might be better off finding a carburetor with electric choke already attached to it.

    Personally, if I had any say, I wouldn’t risk back problems installing a cast iron intake. The Edelbrock Performer 2176/3776 aluminum version is much lighter, flows better and will fit almost any 4-bbl carburetor you have. A person can even find good used versions on CL or on eBay at a decent price. I happen to have a ’86 360 pickup iron intake in my garage – but its not worth the $ to ship it anywhere.

    Getting back to linkage. I asked if linkage is from a pickup or a van (if present). The vans and pickups use what I refer to 1-piece kickdown linkage, which for most people will not work on FMJ’s (it hits the firewall before achieving WOT (Wide Open Throttle)). Only a very few people have been able to get the 1-piece linkage to work (due to a combination of production tolerances being just right).
    If you do not have the correct kickdown linkage – you might want to look into a cable system.
    BudW
     
  5. 78VOLAREWAG

    78VOLAREWAG Well-Known Member

    Messages:
    87
    Likes Received:
    21
    Joined:
    Nov 3, 2017
    Location:
    PITTSBURGH PA
    Thanks for the replies, I believe the engine came from a pick up. No need for kick down, my wagon has a 4speed. The 360 build will come after my 13 year old can pay for it. I just wanted to move a little more air through the 318, for now. I was mainly worried about the electric choke. There doesn't seem to be a lot of electronics on the carb, just idle solanoid.