[Chrysler300] Blocking Intake Manifold Heat Channels

["Mark Lindahl" <mplindahl@xxxxxxxxxxxxx>]

Hello,

After blocking the intake manifold heat channels on a 383 with Carter 3256 AFB, there has been some backfiring.
This happens when the engine is just starting to warm up and when the vehicle is rapidly slowing down for a stop light.
After the engine is warm, this issue is less frequent.

The engine runs great on acceleration and at low and high speeds.  Is this common?
I was blocking the heat channels to keep the carb from boiling over, but it seems to have caused this other problem.
An insulation blanket under the carb has helped, so I probably will remove the heat block shims.

Thanks and Regards,
Mark Lindahl
'63 300 Conv.   (Will be at the Fall meet, but probably only for one night)

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