have a 31 02 sonic 496 ho's running 26p bravo 1 4 blades at 4900-5000 rpm wot , full tank fuel and 20 gal water 2 people 70mph gps . thinking of 28p bravo 1 labbed props ?

My experience is you will likely trade off mid range acceration with the higher pitch but you might pick up the cruise. What are your goals? It seems you are pretty close.

That would indeed be the ticket for increased top end. You need to run at 5000 RPM at WOT trimmed for speed so labbed 28P props would be the recommendation for a little more on top.

Julie