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The July 2019 issue of Hemmings' Muscle Machines magazine had an interesting article about the 426 Street Hemi's true horsepower. Officially, it was rated at 425 [email protected],000 rpm. However, just like the high-revving 340 engine that was under-rated at 275 [email protected],000, the Hemi did not make its peak horsepower until 6,000 rpm.

The article cites a freshly built 1966 Street Hemi that cranked out 459 [email protected],000 rpm and 494 hp. at 5,900 rpm with stock exhaust manifolds and no air cleaner. The engine had solid lifters, an electric water pump, electronic ignition and a .25 increase in compression.

In a dyno test of another correctly restored Hemi, the engine made 425 [email protected],000 rpm (the factory's advertised number) and 500 [email protected],000 rpm.
 

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The 426 Hemi is a legend...definitely the king of the original muscle car motors or at least close. I have read many articles, books etc on the 426...like you said the 425 HP rating was a joke...north of 500 was closer to the mark.
 

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Go to YouTube and check out Nick's Garage, he's the 426 man and has got a million videos on them. Think stock with the OEM exhaust manifolds they made 490hp at 6100 rpm if I remember right from his video on a 100% stock build.

Also Jay Leno's video on his 66 Coronet HEMI is cool too.

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