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The standard basic package for a street application will use factory 360 heads that have been completely redone by Hensley's shop crew, with all new hardware and a great multi-angle valve job and bowl clean up. So your 318 now includes a pair of street/strip heads that are pressure-tested, surface-milled for clean up, and have bronze-wall valveguides installed for starters. To this, you can add swirl-polished, stainless-steel valves (2.02 intake/1.60 exhaust), 10-degree Comp Cams valve locks, Manley retainers, and MP single-coil or Comp Cams or Crane double-coil springs based on application. The springs are also checked for spring height and pressure.