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 ...

When the first modular motor-powered Mustang rolled off the assembly line and on to dealership lots in 1996, it had the same great looks, but the standard V-8 was a Two-Valve mod motor displacing 4.6L ...

For an engine to work, a fresh mixture of air and gas has to be able to enter and exit the cylinders. These induction and exhaust processes also need to occur at the correct moments, otherwise the ...

Time was when a valve job was done with some valve-grinding compound and a vacuum cup on a stick. But no more. Today's high performance engines require the same machining precision in the valves that ...

I know-the Four-Valve motors have, well, more valves; the Three-Valves have that cool cam phasing; and the Shelbys have displacement and boost! Heck, the new Coyote motors have more valves and cam ...