Originally Posted by nonstop (Post 3759838)

Thanks for the input! I was running the 4 blade with the old set up. I tried a 25 3 blade but couldn't get past 4200 rpm. Pulled the motor today and had a pretty bad issue with blow by. Not sure what was up with the rings (only 50 hours or so) but with out a doubt loosing horse power. Fresh oil was getting "dirty" after only a few hours of running. Looks like the crank/mains and rods are ok, thank God!
Glad I pulled the motor instead of just popping on the new heads.
The new combo should put me close to 475/500hp. Here's looking for 70+.