Four-valve-cylinder-head technology is the current darling of the O.E.M. auto industry, primarily because it allows manufacturers to increase power without using a turbocharger or experiencing the ...

Overhead-valve internal-combustion engines, in which the valves are located in the cylinder head and actuated by a block-mounted camshaft via pushrods, go way back in automotive history. Production ...

Setting valve lash has nearly become a lost art. Hydraulic lifters are so prevalent and so efficient that many enthusiasts resort to the old way or doing it—engine running, oil spewing everywhere. Let ...