Why are Flat Plane V8 Engines so Popular Now? The new Lamborghini V8 found in the Temerario is ditching the V10. V10 Engines really are so Rare Now. Even American Muscle Car V8's are becoming more rare as the Mustang and Corvette now use the European styled Flat Plane V8 layout. Thankfully, the lower entry level trims of the Mustang and Corvette still make use of Cross Plane V8's, so some iconic Rumble is still available...for now.