It is confirmed, Bob Madara will do the cams and provide retro roller lifters as well , I will get the cams specs on Monday but he estimated hp to be over 400's

Way to go Diego . Wise choice .

I do have mirage 25p props , any opinion on these? They originally came with stock 454's On this boat.

I mean ,would I be able to reach 5000 rpm with these props?

If you are running Bravo's with 1.5 gears i would speculate the stout 383's will give you equal RPM to the 454's...+200~300 RPM.

Ask Bob Madara where your sweet spot will be. I'm guessing 23's will give you more "snap" and better over all performance.

Hey Man...I'm thinking our boats are going to be about as close as 2: different brands can be. Mine is 25'-5" Center Line bow to transom, 8' beam and 24* dead rise with a dry weight of about 5600 with twin SBC's.My 355" Vortecs with Comp rollers make 400 horse at 5100. With mine I am toying with the idea of Revolution 4's in maybe a Labbed 22~23 to max the RPM at around 5200. I have no basis of comparison for my 255 due to the fact that there aren't many left around. The closest Formula I have to compare to is the 272 LS thru the '80's but none of them came with Bravo's. I'm going to launch with a pair of Mercruiser "Old School" 21" Stainless Steel that will get the engines broken in....but I'm not expecting any serious performance until I start dialing in a prop.

I am very anxious to see what Bob dials in for your rig...and really appreciate you sharing the info...after all...we are the best testing lab out there.

I am curious about your set up with the Bravo I's and the SBC's. I decided to forgo the thru hulls and strainers for water supply and pull thru the drives using crank driven raw water pumps. What is you plan? I am going from old "Log Style" exhaust manifolds and "Pre-Alpha" drives to Vortec "Center Riser" exhaust and Bravo I drives. Talk about your "Retro Fit"...I have had to change everything: hoses, brackets, steering ram, trim pumps, transom assemblies, bell housings, couplers, flywheels...not to mention changing over from mechanical to electric fuel pumps!!

Again...thanks for sharing what you're doing.

hey , of course , i love this site , the idea is exchanging info,it is very valuable.

i do have Bravo 1's , the reason i bought this boat is because i did not want a big boat to start but i shared with a friend a 34 silverton and i loved the idea of a twin engine from the get go, that is why i went with the Nova since i love the lines and overall look, we definately have very similar boats, i meant "retro fit" refering to the roller lifters that Bob is supplying me.

I will start with my Mirage 25's and then i would adjust, i like the idea about starting with something small to break in the engines, we'll see, maybe i can get a hold of a couple of cheap ones to get them started, but beleive me , my pockets have been suffering so much lately!!

The stainless marine set up was a pretty expensive upgrade, that i do not regret because of all the good reputation they have , it is boating after all $$$$$$ !!

thanks everyone again, if it wasn't for everybody's persistence on using Bob, i might not have done it.

I think a lot of people originally think the advice comes off as "mean spirited" since there is a lot of horsepower on this site in general, but usually it comes from having done it our way once and learning our lesson. It's a hard pill to swallow spending that extra money, since not all of us have $100k to burn on this hobby (though I wish I did!!!!) You'll be way ahead of the curve on this one. If everyone wrapped there heads around a little more now will save me thousands later we'd have a lot less advice needed in the tech section

I also like the idea of breaking in on lower pitch prop, I did exactly that when I had my 502 built. It's certainly not required, but letting her run a little more "free" is a real good idea. Even if you can borrow a pair of 21's just for a few hours.

Good luck with the rest of your build, and chime back in on results!!!

Thank you and of course i will get back with the results. I will try to borrow smaller props to start the process, it sounds good.

Cams from Bob Madara were Delivered to me today,here are the specs :

Hydraulic roller

LSA 112
Duration .50 222/228
valve lift .532/.524

I am expecting to turn these engines up to 5200 rpm

I will post results in about a week,

Thanks everyone again , it was a pleasure to work with Bob, hopefully outcome will be just as good.

I would love to get some opinions on the cam specs above design by Bob , well I guess if they were design by Bob Madara, the name says it all,right?