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Problem installing a Demon 1900 on my 340

Raycuda

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I have been having an issue installing a Demon 1900 on my 1970 cuda 340 with the 727 Torque flight transmission. After the install I have a throttle pedal bind about 1/4 way of travel. We replaced the throttle cable, but that didn't make any difference. It seems that the carb is sitting too high with the spacer (7/8") that was on the car with the previous Holly carb. The throttle cable is not a straight fit and comes onto the throttle linkage at an angle. Could that be the cause of the binding? Would a smaller spacer solve my problem? Any suggestions would be greatly appreciated.
Thank you.
 
Isolate the source of the binding.

Can you feel the binding when operating the throttle lever by hand at the carburetor?
  • If so, temporarily disconnect the throttle cable from the throttle stud and test again.
    • If the binding is no longer present, you know its the cable, and perhaps the angle it attaches at the clamp.
    • If the binding is STILL present, look at the throttle pressure linkage
  • If not, disconnect the throttle pressure linkage, and test again at the pedal. If the binding is still present, when operating only the throttle lever, it is either the cable or the carburetor.
    • Next, disconnect the throttle cable from the throttle stud, and using a helper to apply a slight and consistent drag to the throttle cable in the engine compartment, test again at the pedal.
      • If the binding is still present, then it's definitely the throttle cable, and/or the angle of the cable at the clamp.
      • If no binding present, it looks like its the throttle shaft lever, and/or binding within the carb. Check the clearance of butterflies to throat opening at the intake manifold.
If after all the testing, you still cannot find it, remove that wild 7/8-inch spacer and test again.

And like Katfish says, a couple images of the throttle bracket and cable clamp would be nice. A low picture from the front, showing the angle of the throttle bracket as it comes off the intake manifold bolts would be really good, too.
 
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