follow up on overheating 79 spider

["PETER FUGEDI" <cybertrance@domain.elided>]

I am posting this as a follow up on my 79 spider with SPICA that started to 
overheat and would not idle.  I would like to thank Tom Shaines, Joe M. 
Cantrell, and John D. Fox for offering their expertise and trying to help 
diagnose the problem.  Most, including me, suspected a thermostat or SPICA 
issue, given from the rapid rise in engine temperature.  Well the SPICA is 
fine, I never even had to mess with it.  Upon pulling the plugs, it became 
painfully obvious that I needed a new headgasket.  The car now runs great 
with a new headgasket and thermostat.
I can understand why a car would overheat with a blown headgasket, but what 
I don't get is why did it run fine at high RPMs but not at idle?  Coolant in 
the cylinder is a problem no matter if the engine runs fast or slow, right?

Any theories would be appreciated.

Peter in Los Angeles
-one cool spider
-milano undergoing engine rebuild,  if I get it back in time to break in the 
new engine before the convention, I will try to get it dyno'd and we'll have 
a definitive answer as to how much horsepower a stock 2.5 milano with 
automatic makes

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