Read our Catalina 30 Repower Write Up - https://www.betamarinenc.com/engine_repower/tartan-37/

Existing Power: Versions of the Perkins 4-108  &  4-107.  Westerbeke W-40 and W-50    

Repower Recommendations

The Beta 35 or 38 is a great engine for the Tartan 37. It produces all the power required for excellent motoring and low speed handling, while also providing excellent efficiency. 

Beta 35 - https://www.betamarinenc.com/engine/beta-35/

Beta 38 - https://www.betamarinenc.com/engine/beta-38/