TM 10-3930-660-34 3-7. CYLINDER HEAD ASSEMBLY - REPLACE/REPAIR  (Cont’d) NOTE The cylinder head has integral valve guides. Service valve guides can be installed to meet tolerance specifications after cylinder head is machined. 4. INSPECT VALVE GUIDE BORES. Inspect valve guide bores for scuffing or scoring. If guide bores are scuffed or scored, service valve guides must be installed. See REPAIR heading. 5. MEASURE VALVE GUIDE BORE. MAXIMUM ALLOWABLE DIAMETER IS 0.3185 INCH. If guide bores are worn, service valve guides must be installed. See REPAIR heading. 6. INSPECT VALVE SEATS. a. Inspect valve seats for scoring, scratches, or a burned condition. b. If a valve seat is scored, scratched, or burned it must be ground or replaced. See REPAIR heading. 7. INSPECT VALVE SPRINGS. Visually inspect valve springs for nicks, deep scratches, rust deposits, notches at the end of the spring, and for wear between coils. 3-40