The present invention provides an improved rocker arm system for actuating poppet valves in high performance internal combustion engines. The hub includes a front portion having first and second surfaces and first and second tapered contact regions extending from the first and second surfaces to a front face. Each of the legs constituting a bank of cylinders, with a manifold assembly coupled between adjacent banks for the purpose of introducing fuel and expelling exhaust as standard pistons cycle through the cylinders rotating about a crankshaft. The building surface can be the bottom face of a roof, an attic floor, wall sheathing or a soundproofed demising wall, for example. When the pressure sensor detects that the difference between the pressure in the dynamic pressure chamber and the pressure of the high pressure source is below a predetermined value, the solenoid valve is adapted to close, thereby checking relative movement between the master cylinder piston and the input shaft toward each other. By the surface structuring the modulation of the second order non-linearly induced by the thermal poling can be enhanced.