Quadrajet 800 cfm Auto Choke

Discussion in ''Da Nailhead' started by RIV425, Aug 8, 2002.

  1. RIV425

    RIV425 Active Member

    Hi folks,

    I've just joined and this is my first post. I've been reading some of the interesting stuff on this forum and have a question.

    I've got a 66 Riv and I'm about to replace the Holley for a Qjet from the mid 70's.

    Is it difficult to retain the Automatic Choke, I rather like the idea.

    I can see there is an inlet with a thread which I guess is for hot water or is it hot exhaust gas?

    If it's exhaust gas, do I drill and tap a hole in the manifold and run a metal tube to that connection on the carbie?

    Should I bother with this or just replace it with an after-market manual cable choke?

    I would appreciate anybody's assistance.

    Thank You.

  2. BuickStreet

    BuickStreet Guest

    Hi Tony. Welcome to the board!

    My 66 Electra has a small fitting on the exhaust which would have accepted a small steel tube that travelled up to the choke mechanism. Do not plumb it to water!

    I removed my choke assembly completely and don't have much trouble starting on cold mornings in Adelaide. I suggest carefully removing the entire assembly (including the choke butterflies) and storing them carefully taped up with all the small bits.

    You did remember to block off the exhaust heat port which enters the manifold didn't you?

    I know we have spoken about this before so maybe someone else can offer an opinion.

    Bill S.

    I have attached a photo of the 66 425 Manifold I used to bolt onto my 401 which will show you what I mean about the block off. I drilled and tapped one side as the other side is blocked (I poured thinners in there to make sure and it stayed so I presumed it was blocked off)...

    Attached Files:

  3. RIV425

    RIV425 Active Member

    Hi Bill,

    Thanks for the reply. My manifold is not like yours and obviously from an older nailhead. No hole to plug in mine either.

    I had to leave the adaptor plate from the Holley in place because it was for a smaller squarebore.

    I'll be looking for one like yours if you know of any for sale. Mine's not worth machining either because it's had a repair at some stage with some epoxy resin stuff.

    Having it tuned tomorrow so I'll let you know what happens.

  4. BuickStreet

    BuickStreet Guest

    Mmm. The spreadbore must have been an option in the 66 Riv's.

    I'll keep an eye out for a spreadbore manifold. Anybody got one? Meanwhile keep us posted about your tune up.

    Bill S.

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