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At the left, the LS6 exhaust runners flowed 218 cfm at 0.525-inch lift. The ported L92 castings produced 237 cfm at 0.650-inch lift. Though ports have a similar shape, note that the L92 runner has a raised roof and a better shot at the valve. Valvesprings are S-D/Patriot topped with titanium retainers.