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Originally Posted by tomatocity
I heard that GM was supposed to not manufacturer anything over 400 c.i. so they badged the 402 truck engines as a 400.
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The 427 was introduced in 67 and the 454 in 70 so I think that was probably just an urban legend. The 400 badge probably has more to do with marketing than anything else.
My favorite is slightly obscure.. lol
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The largest V8 engine to date appeared in 1968 when Cadillac unveiled their 472 in³ version. This huge engine delivered 375 hp (280 kW) but specialized in torque, with 525 ft.lbf (712 Nm) produced at just 3000 RPM. The power rating was conservative, however, as the engine could produce at least 420 hp (313 kW) in the real world.
http://en.wikipedia.org/wiki/Cadillac_V8_engine
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