So i went and looked at a boat the other day with vp570 and duoprop. Both original with boat in 93 with 1100 hours. Never owned and have little experience with outdrives. Mech said it was a dp_c. Is this a 290? Are they good? Any thing to look for? Parts hard to find? What is the difference between dp-a or b or c? I'm sure i will have further questions. Thanks though.