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For Sale: RK Tek M7 cylinders bored to 800 and ported/polished. These jugs need to be re-plated but are a great starting point to turn your M6 or M7 into an 800 big bore. Also for sale an M7 head re-shaped by RK Tek for running as an 800, and M7 valves with spacer to run with Big Bore 800. $300 OBO for the package. PM me.