The US Spitfires were down on power in comparison with the European
variant, and the Stromberg carb is a large part of why (fitted to get
through US emissions regs.). One replacement option is to revert to the
twin SU carb set-up used for the European models.
Another, more extreme, is to use 4 Keihin motorcycle carbs, as
documented here: http://www.totallytriumph.net/spitfire/engine.shtml
Just two of the many options...
Richard & Sammy
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