The OMC King Cobra RGD 5.7L 350 454 HO Service Manual 507954 is a detailed instructional book designed specifically for 1990 model year OMC King Cobra stern drives boats. It provides comprehensive guidance on servicing and repairing these specific models, allowing boat owners and maintenance personnel to perform necessary maintenance tasks with ease. Made in the United States, this manual ensures that users have access to the most accurate and up-to-date information for their OMC King Cobra boats.