There are probably 20 times more people building hopped-up and stroked Jeep/AMC 4.0L sixes than the Chrysler slant-6, partly because it was in production for much longer but it's also a superior design IMO especially the H.O. variant like I have in my Jeep. AMC didn't have the same strict engine length requirements like Chrysler did for the first Valiant so the bore/stroke ratio on the AMC L-6 is much better. I personally have a hard time being enthusiastic about the /6 when I have an AMC/Jeep 4.0L that makes more power, has more power potential, is stronger (in some ways), and IMO sounds much cooler. Almost like a miniature Cummins diesel if you put a loud muffler on it. I would love to someday build up an old Rambler with a built 4.0L pushing 250 HP backed by an AX-15 or T-5 5-speed manual, much rather do that than build up a slant-6 which has insufficient head flow from the factory and those teeny-tiny bores which restrict valve size. At least for me living at high altitude where all engines make roughly 20-25% less power than at sea level (unless boosted) slant-6 powered Mopars are downright gutless and can barely even keep up on the freeway at 80 mph.
