[Chrysler300] Flooding of Carter 3256SA Carb - '63 300 Conv.

["Mark Lindahl" <mplindahl@xxxxxxxxxxxxx>]

Hi All,

I have tried a few things to reduce/eliminate the boiling of gas in the carb bowls after hot weather driving and shut down of 383.
Within a few minutes, the carb gets so hot that the fuel is boiling and flooding occurs.  I have seen it a few times.
The engine does not run hot during normal driving.  Temp/Gas Guage seem to be calibrated with temp guage around the 1/2-3/4 mark.
At idle and normal driving speeds, the engine runs strong.  Newer open chamber heads were installed about 18 months ago along with hardened seats for unleaded gas.  I reinstalled the original valley pan and now have a 4 bbl. carb instead of the original 2 bbl.

Here is what I have tried.
Installed gasket between hood and radiator support:  It looks good, but does not help my problem.
Installed new needle/seat in carb:  Flooding still occurs, but somewhat less.
Waiting for stainless steel plate to install under carb to reduce heat transfer:  will advise.
I have removed the spring from the exhaust manifold allowing for free movement of the valve: no change.
I took off the heavy metal air cleaner top and now have the air filter exposed using just a flat top: no change.

I also vaguely remember that some valley pans have the the heat passages blocked off to not allow heat back up to the carb.
Since I don't drive the 300 in the winter or much when it is cold, is this a good idea?

Are there certain valley pans with the heat passages cut out and some with them blocked off?
Any ideas would be helpful.  

Regards,
Mark Lindahl
'63 300 Conv.

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