Stage 1 - Mild port and polish - smoothing out casting blemishes, port and gasket matching, mild bowl work, de-shrouding of the valves, combustion chamber cc matching -competition valve job (3-angle) -Comp Cams 105lb valve springs, AC Delco LS1 retainers, and AC Delco LS1 keepers -new valve seals -assembled and toleranced -clearanced for .550" lift

Stage 2 - Full port and polish, port-matching the intake runners, d-shaping of exhaust ports, significant bowl work, correcting the short side radius, polished cc-matched combustion chambers -race valve job -stainless steel swirl-polished under-cut valves in OEM diameter -130lb Comp Cams valve springs, Comp Cams chromemoly retainers, and Comp Cams keepers -new valve seals -assembled and toleranced -clearanced for .600" lift -milling up to .020 free of charge

Stage 3 - Even more extreme port and polish, porting intake runners past the stock gaskets, d-shaping of exhaust ports, significant bowl work, correcting the short side radius, polished cc-matched combustion chambers -race valve job -stainless steel swirl-polished under-cut valves - 1.90" intake, 1.56" exhaust -130lb Comp Cams springs, Chromemoly retainers (titanium optional), Comp Cams keepers -new valve seals -bronze valve guide liners -assembled and toleranced -clearanced for .650" lift -milling up to .030" free of charge -painted high-temp color of your choice

Typical lead-time for these cylinder heads is 2-3 months.  Because they are built to order to customer's specifications, all MMS Ported Cylinder Heads are considered a custom order and are non-refundable.  You can find further information on this and all our other policies on our Policy page here ... https://www.milzymotorsports.com/policies/