To ready the Lycoming IO-540 C4B5 for the RV 10 the engine mounting ears must be changed. The C4B5 comes with the large diameter mounts. Where the Van's engine mount requires the small diameter ears. The accompanying picture is of a used example of the correct part. The required mounting ears are Lycoming's part # 70456. A none PMA'D experimental part is available from A.E.R.O. Here is a link to their website www.aeroinstock.com Also, they are available second hand or from Lycoming.
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