glass particles and generally conforms to and covers the deckplate 32 in the present practice the valve mount stiffener 72 is formed relatively thick with respect to its width with the thickness thereof sufficient to provide the desired resistance to bending under the forces of the pressurized oil in the channels acting thereon referring to fig3 the valve mount stiffener 72 has provided on the under surface thereof preferably recessed in a groove a resilient flexible seal 73 which is contoured and disposed about the various channels to provide sealing of the undersurface of the valve mount stiffener 72 on the upper surface of deckplate 32 if desired the seal 73 may be formed of elastomeric or other resilient material suitable for exposure to engine oil referring to fig1 and 3 the valve mount stiffener 72 has formed on the upper surface thereof a plurality of valving cavities denoted respectively at 74 76 78 80 82 each of which has an inlet passage therein which is ported to the undersurface of the valve mount stiffener 72 for communicating with one of the respective supply channels 42 u2013 50 with one of the inlet passages shown in dashed outline in fig3 and denoted by reference numeral 75 each of the valving cavities 74 u2013 82 also has individually therein an outlet passage denoted respectively 84 86 88 90 92 which is ported to the undersurface of the valve mount stiffener 72 for communicating with respectively one of the channels 52 54 56 58 60 each of the valving cavities 74 u2013 82 has received therein respectively an electrically operated valve such as solenoid valves 94 96 98 100 102 which are operable upon electrical energization.