Pushrod engines may not be as popular as they used to be, but to paraphrase the old Mark Twain misquote, "The reports of its death are greatly exaggerated." In fact, GM recently announced it was ...

General Motors has spent decades refining overhead-valve V8s while much of the industry pivoted to dual overhead cam designs, turbocharging, and downsized blocks. I set out to understand why Chevrolet ...

Inside the hardware: how each valvetrain works Once you look inside the engines, the mechanical contrast becomes obvious. In a pushrod OHV V8, the single camshaft in the block spins at half engine ...