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I run 11.5:1 in my heavier Mustang on 89 Octane. The trick is polish everything for no hotspots (valve reliefs, edges of valve, chamber, etc, and in your case I'd probably have the chambers opened slightly, unshoruding the valves for more airflow and even bore matching while cheating a few cc's out.
With a timing curve of a 26 degrees in no sooner that 2700 or so, and an initial of 12-14, you should be fine on 91 pump gas in the lighter car
The last thing is, make sure you are running a cam with some overlap, if you go with a mild cam, it will ping
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1994 ERA Cobra, 496 Genesis FE TW (new addition to the stable)
70 Mustang Fastback, EFI 489 FE TKO-600, too much to list
71 F-100 4x4 EFI 461 FE restomod
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Last edited by My427stang; 10-12-2004 at 11:33 PM..
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