A properly set up PCV system actually makes the engine last longer because less dirt gets drawn into the engine by the ventilation system. Normally, the road draft tube is cut off (leave the canister that plugs into the block in place) and the PCV valve is adapted into the hole where the draft tube used to be. A solid valve cover (no slots) is installed, and an oil filler cap with a hose nipple is installed with a tube running to the clean side of the air filter. Air is drawn into the valve cover, goes to the crankcase, and is sucked out of the road draft canister, through the PCV valve, and into the intake manifold, taking crankcase vapors with it.
The way yours is set up, there will be little or no purging of the crankcase, other than whatever vapors find their way up through the pushrod valley and into the valve cover. Since your valve cover is vented, even less flow from the crankcase will happen. Keep the PCV system, but improve its design somewhat.
Jerry
