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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 Hagerty.com:

 

https://www.hagerty.com/media/automotive-history/brother-from-another-mother-11-shared-engine-displa...

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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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