The Allison has an integral supercharger. With 6:1 compression, I doubt it would do much more than idle on 100+ octane aircraft gas without a supercharger. They did have different models of superchargers. But most Allisons just had a single speed single stage centrifugal supercharger. Had they been two stage two speed superchargers, they'd have performed on par with the Rolls Royce engines that were so equipped.
The old fighter pilots have a great sense of humor for the most part. Several of them used to send me jokes in my email on a regular basis. Robin Olds is one of the funniest I've ever heard. The guy just keeps me in stitches, my daughter laughs at him like he's Robin Williams.
