C30 425hp propeller specs?

[serpa4]

Doing some research....
Anyone know the pitch, diameter, and shaft size of a C30 propeller on a C30?

 

[BB marine]

The best research you can do to prop the C30 correctly is Load the boat the way you are going to use it and then take it for a sea-trial. Does the engine turn manufactures recommended WOT specifications? Yes right prop. No wrong prop. The factory customer service reps at Fluid Motion can give you the true prop specs of the boat you are looking at. They know what prop was installed on that boat when it left the factory. That prop will give the best overall performance when average loading is done. The prop that was installed on my C26 was spot on when I purchased the boat. The performance was close to as advertised. After 4 years of owning the boat, adding equipment , and loading it down for extended trips the prop no longer fit the bill. I needed to reduce cup so the engine was capable of turning Max recommended rpm. This was not a fuel efficiency move it was a move to keep the engine operating as per design. If you are planning on running in the upper rpm range I highly recommend keeping the engine operating at the upper recommended rpm and not over propping. The only time over propping to add fuel economy may be reasonable ( I would not do this, my opinion) Is if the boat was intended to operate at hull speed or in the lower rpm range for most of its operating time. You may see slight increase in fuel economy doing this.

Contact the factory they will let you know the prop spec and Acme part # of the Prop installed on the boat you are looking at.

 

[serpa4]

From the factory:

Here is what I show for the Volvo 370HP. 
20.00X22. CR4B 1.75" Bore .15Cup, 4.125" hub length

Here is what I show for the Volvo 435HP.
20.00X24. CR4B 1.75" Bore .15Cup, 4.125" hub length