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Next, he reground the intake valve seats to accept larger 2.02-inch valves and cut a four-angle valve job on the intake side, blending the valve job into the bowl slightly. The exhaust flowed well right out of the box, so Hafliger left the exhaust seat and port transition alone. He prefers 6000 Series Ferrea stainless steel valves. For optimum performance in the RHS heads, he back-cut the intake valves 30 degrees.