273 Commando Engine Build

When I rebuilt my 273 I used the Egge high compression pistons. I measured the ratio and ended up with 9.6/1 even though I milled the stock heads .030. I run 93 octane with no detonation. Timing is picky and the advance doesn't come in too quick. It runs well and will get almost 20 mpg if I drive it nice.
The polished chambers may prevent some detonation. Woody did a nice job on the heads.

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