With every passing day the Mule provides opportunities beyond our original expectations. Since the 467ci engine belongs to HPP editor Tom DeMauro, it is at our beck and call. This affords HPP the ...

Crate engines are a lifeline for street-performance two-wheelers and four-wheelers. When Harley-Davidson introduced the Screamin' Eagle 135ci Stage IV Performance Crate Engine in 2023, it wasn't just ...

If you’ve ever wondered how Harley’s doing with their engines, sit down for a bit; we’ve got a press release celebrating that Harley’s just gone and set a new benchmark for performance – and not just ...

As the maker of some of the world’s most cherished motorcycles, Harley-Davidson knows that from time to time it has to offer something for the custom industry to play with as well. So we occasionally ...

An engine's displacement dictates power output based on the bore and stroke, while compression ratio influences how strong ...