Certain LS-based vehicles such as the 4th Gen Pontiac GTO, Pontiac G8 and 5th Gen Camaro feature an M14x1.5 pressure relief valve inside the oil pan. This valve is used to bypass excess oil pumped by the high-volume oil pump when Active Fuel Management and Displacement on Demand are not active.
For those who have deleted AFM/DOD from their engine's ECU and have installed a standard volume oil pump, the pressure relief valve may be removed and plugged. Part no. 814-M14-KIT comes with a hex-key M14x1.5 plug and crush washer to ensure a proper seal.
Note: Removing this valve is not recommended for engines that have a high volume pump. The high volume pump must be replaced with a Melling M295, 10295, 10296, or similar pump before eliminating the pressure relief valve in the oil pan.