carbureted 5.7 - 6.1
They are fine as long as you keep detonation away. If you hear detonation it's already too late. The pistons break the top ring land. Fairly easy but keep detonation away and they are just fine. Don't let me scare you. Just wanting to tell the truth without sugar coating anything . My buddy's truck that had about 215-230,000 miles with heads cams and nitrous. He has stock pistons and runs low 12's in a 5000 pound truck
