When building a motorcycle-engine car, the oil pan has to be replaced with a flat-bottomed pan. This allows the engine to sit flat on the floor pan of the car, lowering the center of gravity. Also, the g-forces experienced by a car engine are completely different from those seen by a motorcycle engine. When a motorcycle corners the forces are still straight down through the centerline of the engine, whereas when a car corners the force pushes the oil to the side of the engine. Through sad experience this was found to make the engines explode. A proper flat-bottomed oil pan has a separate compartment for the oil pickup, connected to the rest of the pan by one-way flappy doors that keep the oil near the pickup during cornering and braking. Note that some flat-bottomed oil pans are made for stunt motorcycle riding and so use a swiveling oil pickup. The car-racing guys don’t have enough experience with these, so don’t use them. Your engine may explode, and this would be bad.