Repowering my twin 290 outdrives

[octowood]

My boat had twin aq171 engines with 290 outdrives, I purchased twin 5.7 L engines
to repower my the boat. Will the outdrives work as they are or will I need to change
any gears in them. I keep getting so many different answers at marine shops.
Thanks

 

[captmello]

Re: Repowering my twin 290 outdrives

According to the 171 owners manual, they came with 2.15:1 gear ratio outdrive. 5.7Ltr engines came with 1.61:1 ratio outdrives.

With they work? I don't know. What Props have you been running previously with the 171's?