The article says it's a 5.7 litre.
The heads will feature two plugs per cylinder using distributorless ignition and a high-fire coil system. Seven inch runners on the intake fed by a 30 % larger throttle body than the 5.9 version. 9.6:1 forged pistons, nodular crankshaft, cross bolted main caps, powder metal rods.
330 HP and 360 lbs.-ft. torque. It will hit 250 at 3500 and pull toward the 325 plus mark all the way to 5500 and is 300 horses at 4500 range. Torque is 325 by 1500 rpm and 360 at 4000 rpm.