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Same displacement, has 67hp and 20ft-lbs of tq more despite not having GDI, .5 lower compression ratio, supercharger is bigger but apparently the LT4 has similar boost to their last gens LS9 with similar size supercharger. The die hard GM boys will always try to distract about this engine "not being a real Hemi" (which it is a real Hemi), but either way, it breathes a heck alot better than their engine does and is still able to keep up even when its a gen behind. The Hemi reigns again.