Abstract: An improved positive crankcase ventilation valve is provided which provides a closed ventilation system by drawing air from for example the air cleaner through the crankcase. The air is circulated through the engine and drawn out of the cylinder head cover by manifold vacuum then into the engine combustion chamber. The improvement includes adjustable means for regulating the amount of air removed from the crankcase and provides means whereby the valve is also connected to the engine distributor via the vacuum distributor regulator for control of the engine spark ignition timing.