Actually the Delco starters are self limiting for RPM. There is a specification for RPM when testing along with amperage draw.
I'd have to read through the Delco manual again to get the specifics but basically the current flows through the field coils and then the armature. At low RPM the magnetic fields created by the high amperage draw in both the field coil and the armature cause the armature to spin.
Since the armature is a coil of wire spinning in a magnetic field it starts to generate voltage in the winding. Since the armature is also a magnet spinning inside the field coils they too start to generate voltage This voltage is opposite of the voltage being supplied by the battery. As the RPMs increase this offsetting voltage increases causing amperage draw from the battery to decrease. Eventually they reach equilibrium and as long as the battery voltage stays constant the RPMs will stay at that peak.
The most common reason for the armature to explode is probably a stuck starter drive. This seems to be more common with the newer style drive. That style drive uses a rubber bumper washer to cushion the gear as it comes to the outward end of its travel. Sometimes they go too far and get past the end of the helix grooves. That type of damage usually has wires thrown out from the center of the armature.
If the wires are thrown out from the armature end most likely the starter has been overheated and the solder melted out of the commutator. You will find the solder around the inside of the back of the starter case.
Your starter most likely is a DelcoRemy model number 1107093. The armature number should be 818002. The same armature is used for the H and M and up through the early 12 volt starters. An aftermarket armature will probably cost you about $75 - $100. Having the starter rebuilt will probably be in the $150 -$200 range.
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