DescriptionGSC Power-Division Intake OR Exhaust Valve Guide for Ford 2.3 EcoBoost – 2 sets needed for complete engineSold individually#### Warning all guides must be reamed and or Honed to size once fitted to the cylinder head, Failure to do so may result in failure, We Highley recommend that Guides be fitted by a trained Professional. ####GSC3017(in/mm)Total Length1.538 / 39.07Outer Diameter0.4346 / 11.04Valve Stem Diameter5.5mm