Brother from another mother: 11 shared engine displacements

[Bryan]

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...

[Mikey8]

The 390 photo appears to me an AMC Rebek “Machine”

[Djens]

How about the most dominant engine ever built and the basis for current engines used in nhra drag racing-Mopar 426 Hemi !

[Millercycle]

A variation on this discussion:   I believe Ford/Lincoln/Mercury covered the 7-liter zone with at least six different V-8 engines, measuring 425, 426, 427, 428, 429, and 430 cubic inches.

[McMinnow]

425 nailhead in 64 Buick Riviera.  With Super Turbine 400 three speed tranny it's a smooth grand touring car.

[fotogmike]

340: Mopar and Buick

[Mike_E_V]

300 cu in. 6 cyl Ford and 300 cu in. aluminum Buick V8. Both from the 60's.

[goraidrs]

425ci Buick

[Vettes4me]

454 Chevrolet ?

[PTB]

406 Ford was one powerful engine.

409 Chevy also was a good package. Both came with tri-power!

[Birduszippidus]

304: Studebaker and AMC

350: Chrysler B-engine 1958 only

301: Pontiac and Plymouth

265: SB Chevy and Pontiac

[johnlangmaid]

'57 and '58 Dodge and Desoto 392 hemi, International Harvester 392, plus current Dodge 392 hemi (6.4L) "Apache"

IH 304 and AMC 304

Bonus Bonus to the 383-Mercury 383 "Marauder"

My IH shop manual has a million mile maintenance schedule in it with various overbores due to the extremely thick cylinder bores.

IH sourced AMC 401 and 232 I6 in mid 70's light lines.

[Jonnyboy55]

Forgot the Chevy 454 and the 400 also used in Pontiac firebird