In the world of engine hop-up components, headers are truly a win-win-win deal. They can deliver measurably better torque, horsepower, and mileage. When swapping out factory iron manifolds for ...

383 Mopar Hop-Up. Originally published in the July 1973 issue of Hot Rod magazine. HOT ROD Staff Writer Jan 01, 2023. See All 11 Photos. ... using many 440 components.