I wish !!!! But I will be happy with 425hp and a fat torque curve

Dont really know Formulas. I thought the twin was the "272"?

Interesting to see how this ends up Id likely put the new mills in the nicer Formula.

Curious as to how and why you ended up with this particular hull, but thats a story for another thread- come on 383's

Uncle Dave

Sell them to Denise the MILF in the Do It Yourself,Boating on a budget thread titled Boat almost sank, what now? :evilb:

I like the way you think...

UD

I'm like a stubborn tree in michigan, leaves still hanging on, but by a thread. must. get. some. boat. info. It's winter up here man, we are all trying to live vicariously through you :evilb:

EDIT: mxfix, if he makes that much power I'll be WAY impressed...though I guess that depends if it's through dyno headers or wet exhaust. Either way, that'll be impressive.

Oh, and speaking of hook, I'm almost positive the 271/272 have one...if your goal is 80, it's gonna be tough...though i believe it's from the inner strakes out I think. With enough power you may be able to get the hull "above" it, but I'm not sure of that.

Formula is pretty well known on the older boats for a very pronounced hook. Real nice boat though.

C'mon Diego. Love the new boat. But dyno these motors already!! Lol. Put te 383s in the formula an sell the MILF the 454s. Lol. Building new dash panels for my 272 with new gauges check formula section

You are correct, the 272 has a hook as I was discussing with the seller James ( lil red).
I don't think 425 hp aside will get her to 80 mph.

Glass the hook out. A lot of people blue printing the bottoms.

ICU, they are going to Dyno shop tomorrow and he needs to prep them, install oil cooler,and then dyno them, waiting...
My wife says I am crazy...
Drove 56 hours in 3 days to get a boat and now end up with 2 boats!!!!

There is almost too much hook to glass out. I believe it counteracts how stern heavy these boats are and could have some very negative effects removing it. It's going to take 500-550hp a side to break 80

Good deal. Nice Lookin boat.

Interesting. Curious if anyone has taken the hook out of one. Wonder if small blocks had same hook as big blocks.

Don't waste your time or money on the hook. There have been guys that have removed it and it made no difference on the top end and made the boat worse at cruise. With my old 242 at WOT the hook would be no where near the water. I believe it was Mopower that has/had a 272 that would run close to 80 but he had 600 hp per side.

As far as props go, my guess is that you're going to need to spin 23's. I'm sure the 23's were the stock props not 25's. The one thing I've learned on all of my Formula builds is that when you build the engine- in order to make more power you have to spin the engine harder, and it always seem mean sticking with the stock pitch prop.

I'm curious what kind of speeds your going to get, my guess is around 72 MPH.

Hi James,

I had the honor to share lunch with sprink58 (John) today and he mentioned to me same thing, not to mess with it,the hook at higher speeds, when most of the boat is out of the water won't have any effect.

I'm thinking that with 400 lbs of weight savings SBC vs BBC along with 800+ horsepower/900 ft. lbs of torque in the water with props that are "Dead Balls On", 80 MPH in an old school hull 272 is a possibility. The ideal conditions will be in salt water, calm wind with a 2' chop...2 aboard for balance.

Occupants WILL HAVE flotation vests and the kill lanyard will be functional and in use.:evilb::evilb:

I think we may see this theory put to the test with a certain '89 272 SR1 after the Holidays...We may also see it put to the test in a certain 255 Liberator about the same time.:evilb:

John are you hitting the formula kool aid???? Lol I don't think 80 but I do see the boats running very well. Stock big block 272's came with 25 mirage props and the small blocks came with 23's. The 23's worked very well on that boat but was hitting 5100 loaded. I only used it once with the 25's the day Diego came to get it.

Well....maybe...but what do you think is the limiting factor? My old 272 with 320 EFI's and Alpha SS drives turnig 23" cleavers and 6000 engine RPM would hit 75 pitot speedometer. Based on that I'm thinking same hull withe 200 more horsepower could spin 25 Bravo's or Mirage props fast enough to squeeze 80.

In theory...?

Ill be putting it to the test. I'm a lil further out as I'm doing cosmetics first. But imma try for 80!! Lol

Go for it!!!:evilb::evilb:

I'm gonna try. Thinking some hefty small blocks. Why I wanna see Diego's dyno numbers. Bravo conversion maybe with -2s. Then have props done by bblades.

Another secret,

There is a chance we might have another 272 sr1 running 400+ hp soon...

Just a reminder to everyone waiting to see dyno results,

This is what "formula 382 sr1"(this is his user name ) achieved with a very similar set up just FYI and installed this on a 272 sr1 achieving a top end of 69 mph don't remember at what rpm's


"We used about the same bottom end. The top end we used world sportsman heads 202 vavles 200 cc runners Bullet cam grind #CHS288/296-10HR part #501000 spec 223/231 @.050 lift .530/.548 110 separation same intake edelbrock 750 cfm carb 425hp @ 5700 rpm stainless Marine exhaust with long risers. I dont remember the Tq. Hope this helps "

One diff. is that I switched to Holley double pampers 750 cmf now and my specs are :

Eagle rotating assembly*
Steel crankshaft*
Edelbrock alum Performer cylinder heads 70 cc*
Performer air gap intake
PRW 1.5 alum roller rockers
Stainless marine "hi torque" exhaust w custom risers
Hydraulic roller*
LSA 112
Duration .50 222/228
valve lift .532/.524*

You got on too John? Lol

Let me make sure I understand this.

A roughly 28 ft boat (give or take a swimstep) with "about" 850 HP runs 69MPH?

How much fuel does it carry, and what does it weigh?

Uncle Dave

130 gallon tank and 5750 dry.

Thanks.....

How long is it with and without the step?

What is the beam

What is the core material?

UD

27'-2" center line bow to stern exclusive of platform. Beam is 96"...24* dead rise 5750 # dry with twin SBC's. Fuel capacity is 130 gals, Water is 25 gals. I always figure average loaded weight at 6500 #.

look at this thread a guy with a 272 sr1 twin 500hp BB going 80mph with a Mirage 25 @5200 rpm

could he reach 85mph with the right prop?

http://www.offshoreonly.com/forums/f...r1-500hps.html

Tommy,,the guy that passed and his wife sold his 311 sr1(the tramp) black and white in the formula section..anyways tommy use to have a white and yelow 272 that he bought with 350 mags and alpha drives..that boat with a higher x dimention which he ordered it 2'' higher ran 70 mph back in the day..then he has a pair of 406's built for it..the boat ran 80 mph but he had problems with the drives blowing up..went that route for a few years and traded in the boat for his 311..

OK...here's some additional info from the "Flat Glass Formul" thread I stated earlier this year.

Thank you guys for all of the kind replies. I love the boat - and it's going to be hard to see go.

That said, it's been a great, trouble free ride for me and will make someone a wonderful 272 and very inexpensive compared to other 27's on the market with comparable power.

In response to the top end, I have rarely run it out but it will run around 70 with some chop on 91 pump gas. The vast majority of the time on the engines has been between 2600 and 2750 - getting around 2mpg! I love small blocks. I'd be happy to share ideas / compare notes if anyone is repowering to SBC's or alpha SS's.

Here are some videos - the IMCO drypipes sound so nice!


This is "zdek's" post on page 3

http://www.offshoreonly.com/forums/f...-thread-3.html

His motors were 350 LT-1's on Alpha SS shorty drives running 70 MPH.

http://i1218.photobucket.com/albums/...2/portside.jpg

http://i1218.photobucket.com/albums/...272/img152.jpg

http://i1218.photobucket.com/albums/...2/engines2.jpg

As I said...my 86 272 with these drives and 320 EFI's running 23" Cleavers saw 75. I think 850 horsepower in this hull could produce 80 with the right set up.

John. Think the 425 ish power and bravos -2 propped right can get there?

Maybe you guys are on to something! Every big block 272/292 I saw or read about wasn't coming close to 75 with 400-420hp. But proof is in the numbers good luck guys! (btw Diego I could never replace big blocks with small blocks, just seems wrong lol)

It's all about room between them lilred. Lol. I looked at big block boats and am glad I ventured away.

As to why move from a set of big blocks to small blocks it can be a step down or a huge step up - all depending. A set of all iron 320 bbc's replaced with 450-500HP half aluminum sbc's can be a dazzling upgrade, from a performance standpoint as well as offer substantially easier access to the mills.

A newer small block with variable cam timing will lay away many a big block.

Im curious to see the interiors of these Formula boats.

I would think you should get more than 70 from 850 ponies, but it seems not.

Uncle Dave

fixx
 

those are not ss drives..

http://www.donzi.net/forums/attachme...1&d=1349371946
http://i231.photobucket.com/albums/e...90304-1823.jpg
Alpha SS Drive

Mike...any thoughts on what they are/were?

Agreed not SS drives.

OK...not SS drives...maybe Alphas with custom nose cone.

I know ,I love how this 272 runs with the 454's , but I need to finish my 383's and then I will make a decision, we'll see ...