Hello Gary -
Sounds like it could be insufficient accelerator pump shot.
Which jets is he suggesting to be changed, and to what size? How
did your mechanic decide which jets to change and the new size -
anything scientific or just WAG? How will you find those jets for
such an obsolete carburetor? Even if jets for the later Carter
AFB would fit, is the internal fuel/air flow circuitry the same as
for the WCFB? Since the 300C was originally intended to run on
only one carburetor at low RPM, you may have upset the A/F ratio
right off idle when you converted to synchronous (non-progressive)
carburetor function - going too lean because of the unintended
extra airflow from the other carburetor. Have you incorporated
the carburetor modifications recommended by Chrysler in Technical
Bulletin #364 of July 16, 1957? That may/may not help, but it
couldn't hurt. I had Jim McGowan do that mod when he restored my
carburetors - excellent workmanship and results!
Depending on the elevation where you primarily operate, you might
also want to consider different metering rods, too, although that
will not affect your off-idle stumbling issue.
Ray Melton 300C in New Mexico
**********************************************************************
On 5/7/2022 12:31 PM, Gary Gettleman
wrote:
To All the Great Folks in 300 Land.
Apparently the cam that we installed during the
C engine rebuild is a bit lumpy as compared to the stock cam.
Have what I would call a momentary stutter when
the right foot presses down.
We adjusted carb linkage so instead of running
on 2 barrels it's now on 4, which has improved performance,
but still get the occasional hiccup.
Mechanic said we need to swap out the jets for
larger size and that will solve problem.
Figure someone else has had this problem and
would appreciate your help with this issue.
Thanks to all.
gary gettleman
300 C Export
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