I-530E Engine Durability 8. Stainless Steel Injector Sleeves This robust system of injector protection is extended-life coolant compatible. 9. Optimized Cylinder Head Coolant Flow Enhanced design of extended-life coolant-compatible cylinder head directs flow and maximizes cooling for long valve and power cylinder life. 10. Replaceable Valve Seat Inserts Hardened inserts add durability and "second" engine life capability during rebuild. Page No. 42 COPYRIGHT© 2011INTERNATIONAL TRUCK AND ENGINE CORP. COPYRIGHT© 2011INTERNATIONAL TRUCK AND ENGINE CORP.