Originally Posted by Cloaked
Go-to is a 13x13 LH for the 454 regardless of the gearing ratio. There are other possibilities. Keep it simple and functional. Don't worry about making Jeff Foxworthy proud.
As was stated, if you want to know the current 4 banger, pull the prop and look on the hub.
My 1990 190 with powerslot trans has a ACME 4blade 14x20. Top Speed right at 50mph. I'm not sure what would have been installed from the factory.
I do have an additional 3 blade that came with the boat but I'm not sure of the size. The dealer that I boat the boat from said that they installed the new 4 blade because the boat was turning 5600rpms with the 3 blade. I have yet to run the prop to confirm rpms and speed.