Thanks caveman for seeing my post on your thread ,mike here has heads that really help him with airflow and more compression even WETVETTE saw this and we even saw on his dyno sheet ,,even with his great heads his torque starts dropping at 5 to 51 hundred so your motor would be worse
This is proof about your cam and Contary to Dennis you can't tune out this much speed unless something is very very off in the motor I doubt your guy could have done this ,,,but p.m. me if I can help

Was the test done in salt water? Are your speed in salt water? Just wondering if 10 mph can be seen with satl water and finding the right combo of prop,camshaft,etc?

Yes It was a salt Water trial.
We will try to make a pm run today with the changes
(smaller diamiter) wheels.

Boat had a full tank last trial also. Will need to add more fuel to be fair on this run. 180 gallons when full.

8lbs per gallon =1440 lbs

Heck ill try it empty

I am sure Powerboat did!!

Those boats will run 100; I believe the first powerboat test was performed at Lake Mead of all places.

If you are so concerned with this 600 hp, have the engines dyno'd, if there was a lie in the article, it was that the engines probably were more only 600 hp.

Fuel is way closer to 6 lbs/gal than 8.

Be prepared for some serious chine walking at 100! The strakes are so low that they entire boat is out of the water and they all chine walk, regardless of who drives it, what power you have, or what outdrive you use.

If I read right, you have a 1985 boat. Is there any chance that your hull has developed a hook?

when we painted the boat we had it off trailer on jacks
while I was on the creeper D/A ing the bottom I checked the squareness where the trailer bunks support it and towards the
keel there were no noticeable arcs or hooks apparent.

Then again there was quite a bit of Black gel coat in my eyes.
and the fear of the V slipping off the jacks and cutting me inhalf.

My old boat, a 26' Mirage was only a couple years older than yours. Spent all it's life on a bunk type trailer. I could check with the boat on the trailer and found a slight hook in the last foot. I used a 4' straight edge. Jacking the back of the boat off the trailer and sanding the hook out, really woke up my hull. There was a lot less wetted surface with out the hook pushing the bow down. In 4' I had about an 1/8" gap above the straight edge.

Good luck

you mentioned that you DA'd the bottom during repaint. Did you go back over with a board or block. If you just used the DA, you may have rippled the critical wetted area. For your goal, every little bit will make a difference. Also there was no mentioned as to what were water conditions on your run.

Finaly we were able to run another test run friday pm.
The test run produced 91 mph. @5300rpm
Sea conditions were calm. Slight chop

these changes were made

props cut back 1/2 inch diamiter
jet sizes increased 4 sizes
Timing at 32 degrees locked


Compression was even all cylinders 155 to 160.
High speed shut down then do a plug reading still reveals
a white plug.

A set of AFR's 335.s with a bigger cam sounds tempting.

Thanks to everyone who contributed to this thread.
Caveman