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4bbl in 68 430 in 225 questions

Discussion in 'The Venerable Q-Jet' started by Topless64-455, Apr 18, 2005.

  1. Topless64-455

    Topless64-455 Well-Known Member

    I have seen some 400 430 motors that have a metal gasket between the carb and intake. When you rebuild the carb do you need that metal gasket and why is it there?

    Also on the drivers side exhaust manifold is a themo flap. When closed what does that do to help the car heat up or fun better?
     
  2. gs4u2c

    gs4u2c Is that a 442?

    The 67 400 and 430 used the metal heat shield under the carb, 68 and on do not. If you're worried about originality you can purchase a new repro one for a Camaro, but I don't think they really do much.
     
  3. Schurkey

    Schurkey Silver Level contributor

    Sounds like the same sort of deal Chevy used up to the '70 models. It prevented hot exhaust gas from toasting the underside of the carb. Also prevented exhaust gas from going down the intake manifold.

    If you leave it out of a '69-older Chevy big block, the engine runs terrible.
     
  4. Nicholas Sloop

    Nicholas Sloop '08 GS Nats BSA runner up

    Yes, it heats up the choke faster. It forces the exhaust from that side of the engine to backtrack through the intake exhaust heat crossover and exit the other side.
     
  5. Topless64-455

    Topless64-455 Well-Known Member

    So if it is rusted shut what would happen after the car warmed up?
     
  6. Schurkey

    Schurkey Silver Level contributor

    Crappy performance because of 1. restricted exhaust, 2. overheated intake manifold-leads to pinging, 3. overheated carb--boiling fuel out of bowl

    Possible cracking of heads/intake manifold because of excessive heat.

    Poor gas mileage due to restricted exhaust and fuel boiling out of carb.
     
  7. Topless64-455

    Topless64-455 Well-Known Member

    Theres my problem!!!!!!!


    Off to the exhaust shop to put duals and to punch out that flap!!!
     

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