15% GSC P-D Ford Mustang GT/GT500 5.4L DOHC Manganese Bronze Intake Valve Guide - Set of 16 GSC Power Division Sale! from 8787 10337 /per Qty. Add to Cart This item is either made to order or has limited inventory. Please reach out to confirm lead times if needed. GSC P-D Ford Mustang GT/GT500 5.4L DOHC Manganese Bronze Intake Valve Guide - Set of 16