habe you been out on the water this year yet? Where are you located? Love to hear that beast

BrendanR 5,800 rpm out of a big block supercharged 509 seems like a fairly high rpm. What is your max rpm?

max rpm is 6000 rpm. This engine is fully blue printed and balance and girdled 5500 is my average top rpm however to achieve 85 mph with my 1.50 hesr and 28p 4 blade prop I had to turn 6k

I have not had it out this year. I have another boat project I am working on trying to finish. I boat on the Tennessee river at decaturville tn and venture down to ky lake also.

My 400 engine would hit top speed at approximately 5,200 to 5,250 rpm with the 23” Mirage Plus prop. The new 406 engine makes peak HP at 5,500 rpm. Power is only 11 HP less at 5,600 rpm. I’m hoping the boat can hit top speed at 5,500 to 5,600 rpm. If so my boat should hit 75-76 mph.