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Brother from another mother: 11 shared engine displacements

Today it’s common to find engines from several manufacturers that share displacement figures. Engineers determined that 500 cc per cylinder is a sweet spot for efficiency with low emissions and, consequently, there are lots of 2.0-liter four-cylinders, 3.0-liter sixes, and 4.0-liter V-8s. Before that discovery, road taxes in some countries also influenced displacement. Plenty of manufacturers ended up with engines designed to fit under certain mandated thresholds. Read the full article on

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303 was shared by Oldsmobile and Pontiac.  The latter was the displacement Pontiac made for the actual race cars they ran in Trans Am racing in 1969 due to the 305 CI 5-Liter limit.  It was not in the production cars.

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