Thanks for response. Props are original and it did get well over 4k rpm,s what i did over last few years i replaced both distributers I purchased them from Summit racing not sure if internally different in anyway
2010 sea ray 205 sport
F-250 CCLB 6.2 4x4 3.73 rear.
Engines
Mercruiser 4.3 mpi alpha 1.62
I used an aftermarket distributor cap and lost almost 400 RPMs but when I changed back to a Mercury part the RPMs returned to normal. Also be sure the firing order is correct and you aren’t running with a couple dead cylinders. If the distributors were replaced they may not be clocked properly. There is a special procedure for clocking the distributors. Make sure the caps are tight as well.