Upgrade your 6.4L HEMI to our Gen III 426 HEMI. Add your own performance parts such as a ported intake manifold and throttle body to drop extreme and reliable power into your SRT-8 Challenger, Charger, Chrysler 300C, Jeep Grand Cherokee, or other LX, LC bodies sporting the 6.4L HEMI. The 426 HEMI is based on a heavily modified 6.4L HEMI Block and then finished off with Arrington Performance upgrades including our custom ported heads for maximum performance and reliability.