One cylinder runner hotter

[gtxpress]

I need a little direction with a problem I was not expecting.  I started the car this afternoon just to keep the juices flowing and noted that #4 was running hotter than the other 3 the on that bank.  I am able to see #5 as well and it is running the same temp as 1-3.  I have noted not seen other problems but now I am confused by what I am seeing.  The other 4 were running 125 to 150 but #4 is running in upper side of 200+.  Suggestions for trouble shooting would greatly appreciated.
Stats on motor;
40 over
Stroked 4.125 or 445 cubes
Ford pi intake with aluminum heads
750 double pumper

Thanks in advance.
Gary

[machoneman]

How do you know this? Heat gun?

[Barry_R]

Exhaust temperature at idle is not meaningless.

But it is really, really close to that.....

[blykins]

Where are you checking it? 

I don't think I'd get too excited over it though.  Maybe pop some spark plugs out and take a peek. 

[My427stang]

Agree, if at idle, at the port, really chasing your tail for a problem that doesn't likely exist

However, if you are bored and can't ignore it.  Check resistance of those plug wires, check to see that plug gap isn't excessive on the hot cylinders, and make sure you don't have any sort of ignition issue that could retard the timing on those cylinders.  However, I think you are likely chasing your tail

Even easier, just idle if up 300 rpm and see if it goes away.  Likely numbers will change significantly. 

[gtxpress]

Thanks for the input guys.  I thought it was kind of strange as I was not seeing any other issues (that I know of) except it does not cool well with the AC on (THAT WAS ADDED) when refreshed.  I did use a heat gun to check and will check  usually after driving sometimes.  I had the wire for the temp switch come off once and drove it about 20 miles or so before seeing it and the car never got over 195.  So I thought this was strange.  Again Thx.