lift mechanism 50 may be engaged with the intake valve 58 an exhaust valve 60 may be located in the exhaust port 36 and the second valve lift mechanism 52 may be engaged with the exhaust valve 60 additional intake and exhaust ports may be provided in each cylinder along with additional intake and exhaust valves disposed therein the cam phaser 46 can be a mid park or end park cam phaser as is generally known in the art although other cam phaser designs can be used with reference to fig2 the cam phaser actuation hydraulic supply system 70 for advancing or retarding the cam phaser 46 for adjusting the rotational position of the camshaft 42 according to the principles of the present disclosure will now be described the hydraulic supply system 70 includes a lubrication system 71 having a main oil pump 72 which can be a variable displacement pump the main oil pump 72 can be utilized for providing lubrication oil to the valvetrain assembly 20 as well as other engine components the main oil pump 72 draws oil from sump 74 and delivers oil through a main passage 76 through a check valve 78 and filter 80 from the filter 80 the oil can be delivered to various components of the valvetrain assembly 20 and returned to the sump 74 as is known in the art a secondary positive displacement oil pump.