Your boat with 330's should run 63 mph. You are down on power, I'd start thinking about a refresh. If it was my boat, I would start saving and find a nice set of 502's. With stock 502's you will have a 70 mph boat and a great platform to build on in the future.

As for props- I've run Mirages, Bravos, Rev 4's, Hydromotive Q IV's. The QIV's will give you the best stern lift, but in my opinion the best overall prop is the Bravo. Again- I would start thinking about new engines, your boat should be faster than 60 GPS.

Im running 25 mirage plus with the 420's with 900 hrs on them. She runs right at 68 with no porpoising. I trim up past the indicators until I start to lose speed then put them back in the water a touch. It only starts to porpoise if i back off throttle before sinking the drives.

You are overpropped. The 23 Mirages were stock, so you are lugging the motors with the extra inch pitch and the extra blade. You might get away with going to 22" Hydromotives, though.

So you think a 24 bravo would be better since its 1" smaller diameter then the hydromotive? Does everyone agree that they need 4 blades on these boats to get the tail up outta the water? Or am I totally wrong? The 3 blades I have heard blow out bad on these boats?

How far can you trim say at 3500 rpm's?

The biggest issue in my opinion is that your engines are tired and need to be refreshed. My boat would turn a 24 hydro QIV to 4600 rpm and 63 mph with 330's. 311's and 292's run the same speeds with the same power. So your two options are to reduce your pitch or rebuild your engines. Reducing your pitch will get your engines in the correct RPM range but I doubt your will gain any speed. With my new engines I went from 30P Bravo's to 26P Bravos and I gained maybe 1 mph and 700 RPMs. Yes it was fun cruising 50 at under around 2500 RPM's, but it sure wasn't good for the motor to be lugging it like that. Don't get hung up on prop pitch, run what the boat likes and forget about the number.

Not to sound like a broken record but I would sell the 330's. My boat was slug with those engines. Since I bought my boat I've had 3 different 454 builds (330, 420, 450 hp) and now 509's (650 hp). There was a big difference the way the boat ran going from 330's to 420's. Yes it's even faster now with twin 650's but the boat really comes alive with 400+ hp. Again- at a minimum rebuild what you have.

I know what your saying about the motors are tired. But you had to turn your 330s to 4600 rpm to run 63...I can run 60 at 4000 rpm. I know that everyone says 292 and 311s run the same. But there still is a weight difference between the two boats. So mine is heavier too.

I think if I'm going to pull motors again, I might just sell the boat...

Just gotta decide what too do.
Thanks for the input, btw how does your boat like the extension boxes?

I run both 23 and 25 mirage plus and have no issue with porpoise. At 3k I'm around 2 on the indicator and wide open I am up around 7 to 8. Boat runs mid 70s.

The extension boxes are nice. They really tightened up the steering and it's a really clean instal compared to the typical external steering set up. The issue I have is, while I went with -2 sportmasters to raise the prop shafts the 7" set back of the box does't give me full advantage of this. What I mean is that while my shafts went from 7" below the hull to now 5" below the hull, the water comes back up once it leaves the transom. I have no idea how much it comes up within the 7" of extra setback but I'm guessing around .75 to 1". So I'm really not seeing the improvement I should have seen with the shorter lower. With 1300 hp, I'm currently at 80-81 mph. I can gain another 1.5 +/- by trimming the extra long skeg down, but I feel I should be closer to upper 80's with this kind of power.

This summer I did a lot of prop testing. When it came down to it, as posted above, the best prop was a BBlades labbed 26P Bravo. Now I need to work on my exhaust. I know my Gil's are not matched to the exhaust ports on my heads. I'm sure this is part of the reason that I'm not seeing the speed I should with these engines. I know that you don't even want to think about pulling your engines, but in time you will be able to do it with your eyes closed, and do it quickly. I don't even know how many times I've had mine in and out over the past 6 years. Ha- too many, I do know that.

Mr. Maine- what engines are you running to see mid 70's? Do you have some modded 502's? If so, what kind of power are they making?