14mm Head Stud Machining Service for Subaru EJ Series EnginesUpgrade your Subaru engine with our 14mm head stud machining service, designed to replace the conventional 11mm cylinder head bolts with robust 14mm head studs. This enhancement strengthens your engine, increases load capacity, and prevents cylinder head lifting, thereby eliminating head gasket failures. Achieve over 500hp with total reliability and maximize head gasket crush. Service Details: Precision Machining: Drilling and tapping the case to