Steve, thanks for the vote of confidence, ...... I think
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I do see OEM style hi torque starters on Summit Racing's website. But they are still large like the OEM so heat may still be a concern because of close proximity to the exhaust. Trying one would be the only way to know. Before settling on an aftermarket starter I would do some research and see if an OEM starter for a late model truck (about 1995 or newer) will fit. Maybe for a truck with a 460? When I bought mine, the parts person at my local Ford dealer looked it up for a 1969 Mustang, it changed part numbers several times, then he handed me the new style starter that also fits mid 1990's trucks. It came with an additional length of 10 ga. wire, a couple if wire tires, and instructions on how to reconnect the wiring.
I've had great luck with my new style starter. Plus every time I hear somebody start a high compression performance motor, they have that distinct cranking sound you get from a permanent magnet gear reduction starter.
In the other camps, Mopars have always used gear reduction starters, before permanent magnet technology and now with it. Rarely do Mopars have a cranking issue. Older GM's like Ford, used non gear reduction starters and it was common for them to have the same cranking issues when hot.
Best Regards,
Mike