Nine hundred and fifty rear-wheel horsepower. “That’s how far you can push a stock 6.4L Hemi block before you need to worry,” says Dave Weber from Modern Muscle Xtreme (MMX). You just need to add a few parts for durability.
We happened to have access to a 2017 6.4L Hemi crate engine at Westech Performance in Mira Loma, California, so we called Weber for his parts recipe, reassembled the engine in two days, and using the 67mm Comp turbos from our sister magazine Car Craft’s 1971 Demon project car, put together a DIY, real-world, 1,050hp combo that should live forever.
The wastegates opened at 16 pounds for this test, so we ended the dyno pull at 5,400 rpm. As you can see, this combo hits 1,000 lb-ft at 4,000 rpm…