Recently, Hagerty Garage got its hands on a 6.2-liter Dodge Demon Hemi V8 engine topped with a 2.7-liter supercharger to rebuild for an episode of Redline Rebuild. With this in depth look of the legendary Hemi we can marvel at the engineering that went into raising this Demon from the depths of Detroit.

Davin Reckow, Special Project Editor,  takes us behind the scenes and shares what how the 840 horsepower engine was built after it arrived in pieces. “Looking at piece by piece, I don’t want to say it’s unremarkable,” Reckow admitted. He added “the individual parts are relatively normal.” 

The block Mopar uses for the engine is a strong foundation which provides piece of mind when adding the larger supercharger. Reckow observes the lack of keyways throughout many of the press fit engine components in the rotating assembly.

Dodge utilized torque-to-yield hardware in the engine, which in some cases like the supercharger vanes can only be clocked in using a factory jig.

Another observation that Reckow made are the gaskets, which from the factory are a thin metal piece vs cork and paper gaskets. This eliminates the need to hand apply any sealant to the heads while the oil pan gasket only needs four precise dabs of sealant around the main seals.

The Demon Hemi is a hefty package by almost every definition and measurement, but it clearly means big horsepower.