Heat soak & my starter motor

[GeoNort@xxxxxxx]

There are several things which could effect no start when hot. First of which 
is the posiblity of heat expansion due to the non stock manifold/ exhaust.  You 
may try to rig a temporary heat shield to see if that improves the condition.
Failing in that I would suspect the starter itself. You say it is a rebuilt 
from a chain store.They are not the best place to buy a rebuild from. I have 
have some failures when I went that route. There may be some malalingment or 
warpature in the shaft in the armature which when it heats up causes it to 
bind. There is also the possiblity that the rebuilder did not do a proper job 
cutting the comutator.Which you would not know with out disassembling the 
starter.  I assume you did not have this problem with the old starter before it 
gave up. Since it is life time  I would next proced to getting a different 
starter. Good luck. keep the group informed on your progress
George 

1964 LeBaron
Manteca, Ca