Re: [Chrysler300] Exhaust gas temperature

[<smopar@xxxxxxxxxxxxxx>]

With today's gasoline, a 440 that doesn't ping is a rarity when timed correctly.  Assuming the heat level you are experiencing is really abnormal,  I would suspect the timing isn't really proper.  Keep in mind that 1970 and later 440 engines at least had solenoids that retarded timing at idle 5 degrees to better control hydrocarbon emissions.  Off idle the distributor provided normal advance.  If you no longer have an operative solenoid or have replaced the original distributor with another one without such a solenoid, then you might want to adjust the timing for more advance compared to the factory setting recommended.  Basically, retarded timing sends exhaust heat down the exhaust rather than more efficiently using the energy to propel the vehicle.  

Even today's new vehicles implement very retarding timing at cold start to rapidly send heat down the exhaust to quickly light off the catalytic converter within about 15 seconds for clean emissions.  Some techniques haven't changed all that much.
Steve Albu
---- John Nowosacki <jsnowosacki@xxxxxxxxx> wrote: 
> Hi group,
> What are the causes/cures for excessively hot exhaust gas temperatures on a
> 440 V-8?
> My friend has a car with a 440 that seems to run fine, no pinging, correct
> timing at idle, no overheating or boil over of water/coolant, but it is
> always very hot under the hood from the exhaust manifolds and rest of
> exhaust system.  If timing at idle is good, could it be that it is not
> advancing far enough with throttle open while driving causing a retarded
> condition which causes the manifolds to get hot?  Could a carb with too
> small of jets be causing a lean condition while throttle is open while
> driving?  Could a too radical of replacement cam during engine rebuild cause
> this?  Any theories appreciated.
> 
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