The prototype RV-10 aircraft used a Lycoming IO540 D4A5. The second factory plane used a Continental IO360. To save a few shekels we used a rebuilt variation on the aircraft engine the Lycoming IO540 C4B5 out of a Piper Aztec airplane. Of course there are some difference between the two engines such as:
Power rating
Engine mounting ears
Hot Prop Flywheel
Prop Governor
Prop Governor mounting studs
Manifold pressure source
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