For 1997 and up LS1feature Stage II CNC-ported cylinder heads and matching hydraulic roller cams to deliver great midrange and top-end power
All kits include MLS head gaskets and shaft mount roller rocker arms
As with many engine modifications, custom tuning is recommended when using these kits. Shipped separately from factory. NOTE: SKU numbers ending in F are factory shipped and may take a little longer to reach you.