Pusher-
Propping a boat is not as easy as one thinks, so many variables and you need to be cautious as motor early wear and damage can result. I decided to prop up 2" of pitch due to the 17p on it now hitting max 5800 rpms very easily and I had to stop trimming the motor up to keep it under that max. This particular 140 HP inline six has an operating range of 5500 - 5800 rpms. Each inch of pitch increased takes away as a rule of thumb 200 rpms so you have to be very careful as to not drop the motor under and cause it to be lugging. Then there's the hole shot and how quick you jump on a plane. From the hole to a plane can put even more strain on the motor if over propped and you don't want to wallow around trying to get up and out.
I don't think this boat and motor combo will have any issue with a 19p but I really don't expect much more speed from it, a few mph at best but I will have the rpms in the range I want them with the right trim. A newer design of prop is always a concern too, if you're using an older prop is may not have all the newer enhancements like cupping and aggressive rake.
Rob we have the same size boats that are laid out similar too but they're powered differently, I'll be very interested in seeing how yours runs with the new prop.
And I bought some on sale at a store close by. Ill have to check it out online for my next build.
You did see the 5 giant bricks I put on my transom when I first started didnt you lol. Better safe than sorry!
