This Simple, 30-Degree Valve-Angle Trick Is A Quick And Cheap Way To... HOT ROD Staff Writer Aug 29, 2007. ... atmospheric pressure pushes air in through the carb, intake manifold, ...

For example, let's say we have a 2.02-inch intake valve with a valve lift of 0.500 inch. 3.1417 x 2.02 = 6.34 inches of valve circumference. 6.34 x 0.500 = 3.17 square inches of valve curtain area.

The three-angle valve job is the most common and is what we opted for. The cut on the valve face and corresponding valve seat is the same here: ... more air can get past the valves sooner.

For decades the idea of electronically controlled electromagnetic, hydraulic, or pneumatic valve actuation has been studied, developed, and ultimately abandoned by big-name engineering firms such ...