GM LS Retro-fit Oil Pan – 1955-87 GM/Muscle Car/Classic Car/Trucks. GM’s popular LS engines are finding their way into a large variety of vehicles. They make great power, plus they’re very durable and reliable. Unfortunately, the factory LS pans don’t always fit or they hang too low for today’s hot rods. Holley’s new LS Retro-fit Engine Oil Pan is designed to help! It provides maximum clearance to the chassis and ground, plus provides an OEM fitment for durability and proper sealing.