31AD-B motor

[Pat688]

I acquired a 1977 20’ Chris Craft that has a Volvo Penta 31SD-B 4 cyl motor and Volvo drive with counter rotating props. I’m trying to determine the horsepower and how to ID the props. I can’t find ID plates on either the motor or Outdrive and only found one number on the three blade prop. Anyone have anything that might help?

 

[Pat688]

I acquired a 1977 20’ Chris Craft that has a Volvo Penta 31SD-B 4 cyl motor and Volvo drive with counter rotating props. I’m trying to determine the horsepower and how to ID the props. I can’t find ID plates on either the motor or Outdrive and only found one number on the three blade prop. Anyone have anything that might help?

Correction, 31AD-B motor