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The Porsche 906’s original 2.0-liter SOHC flat-six engine makes 207 hp, but the enlarged 2.5-liter power plant on chassis No. 906-120 now develops about 256 hp at 6,600 rpm.
While 50 examples were required to meet Group 4 homologation requirements for competition, the 906 comprised an official total of 62 cars, according to the factory. Of those, 52 were fit with the 2.0-liter flat-six engine.
read more: https://www.yahoo.com/lifestyle/car-week-porsche-restored-race-120000068.html?fr=sycsrp_catchall