Despite launching almost six years ago, the Valve Index is still able to keep up with many of today’s PC VR headsets. Of course, there have been plenty of headsets since then, including cheaper ...

of torque. A redesigned block and head, robust heavy-duty pistons, new performance intake manifold, improved intake/exhaust port flow, a new turbo, larger cylinder heads, bigger valves and a ...

As the heart muscle contracts, it propels the blood out into the vascular system. The heart’s chambers and valves are arranged to direct the flow of the blood as the heart beats. The heart has two ...