Hi Richard,
The carb socket area should not see particularly high temperatures.
The clamps are probably too tight. Of course, if the plenum pops
out in flight, the engine will run very rough.
Do you support the plenum on the firewall side of the box? I have a strap
of aluminum coming up to a nut plate on the back wall of the plenum.
It seems to help support the intake system combined with only moderate
tightening of the band clamps
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Ira N224XS
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