I have recently completed a 25 year sanger super jet 460 rebuild, and today took the maiden voyage.  1977 It is a 12jg and had an "A" impeller and would max out at 5200 and ran very, very, well. Years ago I rebuild the motor, I had research the impeller chart and decided to go with a "B" impeller. after all this work and today it did not seem like had the  snap or top end. Hey it runs good but I am thinking I went the wrong way. I figure we have 400 - 425hp maybe I should I have stuck with the "A" impeller?  "Original 330 hp A impeller"
 What is the rule of thumb with 50 - 100 hp? do you go down or up with hp only not increase rpm.  should I have stuck with the A?


If a pump came stock with an A impeller and you build the motor for 100 200 Hp 100-300 rpm increase,  what would you want do do with the impeller..  what is labor cost for new impeller install.

thanks for your input,
millmnt