97 z222 5.7. Rpm questions
 

Hi newbie! Owned several boats. Just bought boat listed. Wot question. I have yet to put boat in water. Just curious before I do. What should or what do you see with 19p aluminum prop for rpm's and speed? Old owner has done alot of work to it. Says loaded down 4100 rpm and 42 mph. Have me another 17p prop to try. Any thoughts appreciated! Also wot on motor says 4200 to 4600