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Hiro of SP Engineering begins valvetrain assembly using the HKS Step Pro L kit. The Pro L kit requires the use of a HKS Step 3 piston due to a higher lift and smaller base circle design. Also noted from HKS is the need to modify the cylinder head to clear the larger camshaft lobes because the new setup can spin to a maximum 10,000 rpm. Valve stem seal set, valve retainers, lifters, and valvesprings all comes with the Pro L kit.