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What I mean by "overbuilt" is that the Allison's main components could handle far more horsepower than the engine was designed to produce. The Merlin, OTOH, wasn't quite as stout. Its components were far closer to design tolerance. It made the Merlin lighter per HP but more fragile. Reno Air...

Yes, the single-stage centrifugal supercharger was the Allison's biggest drawback, but it was the USAAF that demanded it be that configuration- they believed that turbo-supercharging using exhaust would provide better results, and they intended it to always be a low-altitude engine. Of course...

I'm in the process of rebuilding an Allison V1710 right now. It has to run by next month... Making 66-year old worn out parts into a running machine takes patience. And a little luck, though this isn't the first Allison I've helped assemble. But this one is far more a collection of worn out...