If I remember the 420 redlines at 5400?
You could have your 25's reworked and I bet you would be at 71 mph.

Sorry to butt-in with a non Fountain.
The bottom of my 1984 Excalibur 31 is nearly the same (pad bottom notched transom).
Anyway I'm running worked 330s: bumped compression, bigger valves in the small port heads and some other crap. Merc trans- TRS. Props turning IN!
Running the 25 mirages at 5100 RPM I could hit 70 (GPS) in a nice chop with a light load.
This year I'm trying the 26 Bravo 1 4 blades.
Yesterday, conditions were just right and I managed to eek out 66.6 at 4600 RPM (GPS).
I really like the bravos for cruising and getting on plane, the 25 mirages would tend to blow out, getting on plane in rough water. My cruising speeds are pretty close to BROKE's (I really need to bring a pad and paper along and write that stuff down)
I am over propped, though. If I'm not getting any air, WOT is like 64 MPH at 4300RPM.
Neither props give me enough bow lift.
Anyway, I just thought I would share my results.
DS

We wen't out again yesterday - about 90 degree's small chop, not many boat's on a small fresh water lake. Only two of us with a small cooler of (Water & Pop for after testing) but all the other regular junk still down below. I had the 23 pitch props on and got about 5300rpm's out of both motor's. To do this I had to trim it to the MOON!! It was finally getting pretty light but still under control. I think I have one trottle cable that must be in a bind or something because it won't go as far forward as the other.

During normal running I usually get up on plane and them trim out just a little bit from 0 to 1 1/2 on the indicator's, any more and it statrs to porpous to much. Keep in mind the Tab's are down when planning off then brought back up to about 4 or 5 with about 3 being netrual. Does this sound about right with how you guy's are running?

Oh yea, Prop's are turning in also.

Great thread!!

This weekend comming up is when we are going out again. I'll have my 26's back in a couple of days. Meanwhile I put the 25's on to start with this time. I'll let you know.

I run my tabs at 3-3.25 (neutral) pretty much all the time. Actually for some reason the port side always needs to be lower by .5 it would need to get rougher than 2' to lower them to 4. The trim of course all the way in to plane (leaving the tabs) then depending on conditions anywhere from 3.5 to 5.5 cruising. sometimes like you say I'll get a porpus rithum, then I touch the trim to 3 it stops right a way then trim out again. For w.o.t. it should probably be out to 7-9 then tabs up... I don't because my wife is holding my infant in her arms, so tabs at 3 and drives at 4.5 is real smooth up to about 2' chop.
If I put the trim in to 3 it's like putting on the brakes. I actually lunge foward.

Anybody have a trailer for a 33 they want to sell? or trade?

Sorry no dice on the trailer.
Saturday I brought along a pen and paper.
Zipping down a FLAT shipping channel (no current to speak of).
Running the 26 Bravo 1 4 blades.
It was near 80 F.
3 people, gas tanks less than half full
All speeds GPS:
RPM-----MPH
3000----44
3200----47
3600----52
4000----59
4500----66
I trimmed the crap out of it to get the 66 MPH!

DS

Zanie,
Do you go to Air Marine for prop service? I had my 26 Bravo's worked back to 25 pitch. All they had to do was cut the tips back. The prop keeps its original shape.
Dan

I am planning on bringing them to DAH in Burlington WI this winter. I was gonna have em remove some pitch and 'work em' for more speed.
We'll see how they do.
DS