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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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Your article states the 401 was the largest size of Buick Nailhead engine.  This is incorrect.  In 1965 and 66 the final year for the nailhead, a 425 CI version was available.  


Which brings up another displacement match.  Oldsmobile also had a 425 CI V8 from 1965 thru 67.

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