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Well they are a couple of things that could have happened. The Powermaster starters are known to have a weak starter drive and they don't tolerate being messed with. The starter drives are also no repairable, you can't buy that part, have to replace the whole starter. I really don't like Power Master starters because of that. The good news, it's very likely you don't even need a special starter. The OEM Ford starters are really good and work well, even with high compression engines. I was running a Ford OEM starter on my 12.5 to 1 compression ratio 427, no problem. If you suspect the Power Master is bad, just buy the best quality Ford OEM starter from NAPA (50-60 bucks) and try that first, before you drop $250 on another fancy starter you don't really need.
Now another thing that could have happened is the starter ate the teeth on the flywheel. If so, thats real bad news, gotta pull the trans to get to the flywheel to have the ring gear replaced by a machine shop.
From your description it sounds like the starter it TRYING to engage and turn the motor, but the motor don't turn. Most likely you've wiped out the starter gear internal clutch on the starter. The starter gear will FEEL and LOOK fine, on the bench, it will fail when placed under heavy load, like cranking the engine. Thats my best guess!
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