An overview of the bottom of the 5.8 block shows no changes at first glance. The main bearing caps and their six-bolt retention is carryover from the 5.4, as are the three shared PCV breathing and oil drainback passages visible on the inside of the block skirt. Also common are the three round bay-to-bay breathing holes in the bulkheads as modeled by the rear main bulkhead in this view, along with the oil pan rails, bolt patterns, and such. Get close and there are differences, however. SVT notes the 5.8 main bearing caps have an extra chamfer on them to ease assembly, but they remain interchangeable with the 5.4 version.