Ls3 821 & 823 CNC Ported square port heads (Pair) *Heads started as a set of low mileage cores. All Work was completed by a professional. No run time since work was completed* - GM OEM 821 or 823 Castings - Walnut blasted finish - New CNC ported runners - Stock Chamber CC Size - Heads are bare no valves or hardware included **Final valve job and proper decking required to ensure proper assembly** LEAD TIME WHEN ORDERING 5-7 BUSINESS DAYS
