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The Judd GV4 and GV5 seem to be pretty competitive in terms of power; it's just a reliability issue. The truth is that no major manufacturer has tried a normally-aspirated engine for a while. Bear in mind, though, that Porsche were due to switch from turbocharged to normally-aspirated in 2000, and had withdrawn from the GT Championship at the end of 1998 largely because their blown engines were not competitive.
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