How Fast, Y2k,staggered Big Blocks.
 

So What Do You Guys Think ??? Staggered 496'ho's..............staggered 525's ???

Re: How Fast, Y2k,staggered Big Blocks.
 

Hey Gary,
Why not sell your Superbabi hull to me and build one with staggered 600s... :evilb:
Personally, I think two big blocks is a bit much. One monster with the gear splitter so you could run two drives would work great... :D Or
Twin 500HP 427cube aluminum small blocks would be cool. Would not need the stagger and could keep the weight down... :cool:
I'd take one with just my little 502 if the wife would let me... :rolleyes:

Re: How Fast, Y2k,staggered Big Blocks.
 

Before we do all this mind work, WHAT's THE GOAL?

I am headed towards a crate 572 or build a single big (BIG!) block, normally aspirated to build hp the old fashion way. My recent work experiences with certain blower companies leaves a sour taste.......

there is no substitue for cubic inches, except CUBIC INCHES!!!! :)


so, again, WHATS THE GOAL??????????

Re: How Fast, Y2k,staggered Big Blocks.
 

lets supose the goal is to put inexpensive power into the boat, say 900 hp or so for speed and reliability, and to have it warranteed more than 6 months. If you threw 2 496s into the boat and an extended the warrantees on them (what, 4 or 5 years?), the question is would the 850 hp actually make a difference (over single big power) cost wise, speed wise and reliability wise, despite the extra weight and fuel consumption?

Re: How Fast, Y2k,staggered Big Blocks.
 

Hey Krak,
I think the goal may be to do the mind work... :D

Having been an owner of a twin engine boat and knowing all of the added time and $$ that goes along, I'm for sticking with a single.
There are many benefits to having twins in a 30' boat though. You could bolt in 850 to 1050HP engine drive packages with great reliability and 5 year warranty. And we would not be talking about bow lift problems for sure. The boat would handle around the docks better too.

So Krak, your not thinking to convert your 425HP/496 into a 525HP with those aluminum heads and headers...
Going to Big Power the old fashion way with a 540, 572 cube or bigger. How much HP you thinking? 600,700,800??? :evilb:

Re: How Fast, Y2k,staggered Big Blocks.
 

RTALYOR, YES YOU HIT IT PERFECT. STOCK 496'HOS NO PROBLEMS, JUST TOP END WITH STOCK DRIVES. KEITH ARE YOU THINKING OF CHANGING YOUR DRIVE ??? WHATS YOUR GOAL ??? ANY WAY THE TOPIC WAS TO DISCUSS TOP END ON THE STAGGERED BIG BLOCKS. WE HAVE ALREADY DID THE BIG CUBES AND THE GEAR SPLITTER. SO ANY THOUGHTS ON "HOW FAST"????

Re: How Fast, Y2k,staggered Big Blocks.
 

OK Gary, I'll bite...
The Y2K that was built with twin 320HP/6.2s runs around 80mph.
So with 210HP more (425s), you likely see 92-93mph.
With another 200HP (525s) the boat would crack 100 without question...
The boat's not going to have a back seat though. Where we going to put the babes??? :D

Re: How Fast, Y2k,staggered Big Blocks.
 

Pat You Do A Short Stagger. Yes Some Of The Rear Seat Would Be Lost. Perhaps You Could Have A Small Narrow Seat. If Not 3 Buckets Across The Front. But The Goal Here Is Top End. And You Have Safe Easy Power Plants That Will Keep On Running Year After Year !!! This Is All Just A Thought At This Point. :D

Re: How Fast, Y2k,staggered Big Blocks.
 

You Want Stagger Go Buy a Cigarette Not In One Of These Things

Re: How Fast, Y2k,staggered Big Blocks.
 

lightspeed:

care to offer any editorial on that suggestion to get a stagger with a cigarette and not a superboat 30'?

Re: How Fast, Y2k,staggered Big Blocks.
 

Oh No Gary,
The guy that bolts the motors in place doesn't like the idea. :p
You can buy two 425HP small blocks cheaper than those 496HOs anyhow. :cool:
And we'll still have room for the babes too. :drink:

Re: How Fast, Y2k,staggered Big Blocks.
 

Gary, If your trying to get speed and reliability, just have a big motor built with a speedy drive. Even if you go stock twin set-up, what do you think keeps Merc sevice departments open? You think stock engines don't have problems? Take a look in the back of a big Merc shop. You'll most likely see a few broken stock Merc short blocks. I know we do over here. Look at the valve spring issues on HP500, oiling issues on 496HO, Hello!

Re: How Fast, Y2k,staggered Big Blocks.
 

No Bad Feelings.... Lightspeed, But If I Had That Much Money , There Would Be At Least 5 Other V's I Would Buy Over A Cigarette. Now Guys, Lets Not Get To Crazy About This Staggered Big Block Thing, It's Just An Idea. Now Faster, As For Big Power, On An Xr Drive You May Also Keep The Merc. Mechanics Working On The West Coast. I Know Here, They're Blowing Them All The Time!!!!

Re: How Fast, Y2k,staggered Big Blocks.
 

Im sorry did somebody say speed and reliability. Yes cubic inch and a speedy will make you smile but the speedy takes more power to spin than you would expect. Now a big air pump on top of my cubic inch would reallly make me smile! As far as speed for a stagger it all a guess and everybody knows they never run what we expect.

Re: How Fast, Y2k,staggered Big Blocks.
 

Baja,
You may be correct, however, I ran 700+ HP in an XR for over 100hrs before I sold my cat. Remember the stock Bravo in the 90's? I had 600hp and 250hrs before it was done! There are several others that are doing it now out here. People who hammer the throttle when taking off, or don't throttle proper when airborn will replace a drive every season. If I was offshore racing, there's no doubt I would have a spent thousands more for a race drive. But with the luck I've had before with the XR, I could last three seasons and then buy another for less than a speedy. Just think, Merc gives a warranty with 600HP for how long? If it could handle the punishment by people who don't know how to drive, they would warranty it for more HP rating for people who don't abuse thier equipment. In other words I know someone local that has the same engine as I in heavier boat with 150hrs so far. I'll let you know when his or mine goes south.

Re: How Fast, Y2k,staggered Big Blocks.
 

Just got off work and catching up on this - I have two goals, both are dreams right now more than goals.

Gari, my goal would be a single that is reliable to 85mph at less than 5000 rpm, and of course an upgraded drive but I haven't researched that yet. I like the idea of staying beside 90% of the twins I run with for half the weight and fuel costs.

The second goal (dream) would be to see this Y2K hull capable of the century mark and still use pump fuel, both these dreams WITHOUT BLOWERS. Hey, a guy can dream, right?

Re: How Fast, Y2k,staggered Big Blocks.
 

As I Said This Thread Was Started For Positive Feedback On How Fast A Y2k Would Go With Two Stock Power Plants . Not A Spar Fest To Discuss Big Cubes And Out Drives ...............THANKS GARY

Re: How Fast, Y2k,staggered Big Blocks.
 

It all sounds great...but reality keeps kicking in in my mind (im using the KISS method...KEEP IT SIMPLE STUPID!)which is what Superboat is all about. What it all comes down to, when it gets snotty out...(alot around here), you can only go so fast. I like the fact you can walk aroung the engine in the Y2K. You'll just be throwing money around and I for one dont want the extra maint. associated with twins. I do like the gearsplitter and dual outdrive set up with the SC850 though :D
I think lightspeed said it best. You Want Stagger Go Buy a Cigarette(or something else) Not In One Of These Things

Re: How Fast, Y2k,staggered Big Blocks.
 

then how abou tthe diesel JC was supposed;y building? what about a singe diesel, theyre building them lighter these days. reliability and some fuel consumption savings, no?

Re: How Fast, Y2k,staggered Big Blocks.
 

RTALYOR I LIKE YOUR IDEA...........BUT NOW I'M THINKING SINGLE " TURBINE " !!! :evilb:

Re: How Fast, Y2k,staggered Big Blocks.
 

Gotta remember that alot of the earlier 30's were ordered with twin small blocks. "Zul Specials". 600+ HP each. Screaming machines !!!

Re: How Fast, Y2k,staggered Big Blocks.
 

600 hp each? any pics? how fast did these zul specials go?

Re: How Fast, Y2k,staggered Big Blocks.
 

Who remembers the R C marine 30 all yellow. That boat was unbeatable until it was torched. If you cant beat it burn it. The motors made great power but where not cheap Kind of like nascar motors running high rpm. Not your average 5000 rpm motor more like 7500. JC performance could fill you in more im sure. All I know is they where unbeatable. Add todays technology with some good bravos and herring props and you could probably add another 20 mph.

Re: How Fast, Y2k,staggered Big Blocks.
 

So with twin 320 hp youre doing 80mph, you dont have to stagger (room for babes), the weight of each is about 200 lbs less than a big block (totalling 400lbs). How about fuel efficiency? Would you be approximately half way between a single big block and twin big blocks?

Re: How Fast, Y2k,staggered Big Blocks.
 

Here's a monkey wrench into this post,how about a 34,with staggered 572's with good drives!!! :eek: :eek: :eek: tripps


ps it will give jd room to move around!!!

Re: How Fast, Y2k,staggered Big Blocks.
 

So perhaps the way to go is a pair of side by side small blocks. Lets say max hp at 575-600 per side. This way you could use the merc. XR drive and be ok. I'm thinking ZUL MOTORS !!!!!.....................So what do you think HOW FAST !!!

Re: How Fast, Y2k,staggered Big Blocks.
 

ZUL IS The Best Guy Around With Small Blocks But You Better Have DEEP POCKETS

Re: How Fast, Y2k,staggered Big Blocks.
 

John how much you think ??????.....$$$$$$$$$

Re: How Fast, Y2k,staggered Big Blocks.
 

How fast you want to go?
I'm quite sure that you could have a set of 450HP/383 strokers built complete for under 25K. That should push a Y2K near 100... :eek:

Re: How Fast, Y2k,staggered Big Blocks.
 

thats what I would do.

Re: How Fast, Y2k,staggered Big Blocks.
 

how reliable would those 383's be? easy for anybody to work on them?

Re: How Fast, Y2k,staggered Big Blocks.
 

A 350 bored and stroked to 383 is the most common stroker motor built.
The Merc 320HP 6.2 (377) is a 5.7 (350) with the 3.75 stroke crank.
GM Performance Parts sells a 425HP 383cube with aluminum heads for like $5000. It makes the same HP and Torque as the 454HO...
Small Block Chevys have more after market parts available than all other engines combined. This fact makes building up a small block a lot less costly than a big block.
I bought my boat without power and was considering going with a stroker small block. Then I got a deal on a 310HP/7.4 Volvo Penta that was too good to pass up. Then I was kicking myself when I started buy parts to build up my 454. Twice the $$ for big block parts vs. small block parts.
JMK has the Merc 320HP 6.2 in his 24' Super and kicked my butt until I re-powered with a 502.
It is my opinion, that if you want twins in a 30' Super, stroker small blocks are the way to go... :drink:

Re: How Fast, Y2k,staggered Big Blocks.
 

You know the big deal with a Y2K is having a 30' boat that can blow almost anything away with a single in this size range. That's what amazes people. Not another 30'er with twins. :cool:

Re: How Fast, Y2k,staggered Big Blocks.
 

with the small block, then, you dont need to stagger (but you could). But for a guy who knows next to nothing abuot engines, is this the thing to get involved with if you want hassle free, dependable engines?

Re: How Fast, Y2k,staggered Big Blocks.
 

Aside from the "it's got a big block" aspect, I've struggled with why not to use a 383 for 450hp and below applications. Like you said, parts, upgrades, etc. cost roughly 1/2 that of a big block. Added bonus is higher rpms for a given piston speed.

Re: How Fast, Y2k,staggered Big Blocks.
 

Yeah, but 801 hp has gotta cost an arm and a leg if youdont know what youre doing with engines, like me.

Re: How Fast, Y2k,staggered Big Blocks.
 

Hey Faster,
I do agree with your statement. But this thread is about twins... :cool:
Maybe we should start a Pole or thread, " What to Power a 30' Y2k Superboat with?"... :drink:

Re: How Fast, Y2k,staggered Big Blocks.
 

Anyone else read the new Family and Performance Boating magazine article about the IMCO splitter drive mounted in a 35' Nortic? Single 1400hp Teague engine driving two outdrives. Also running a very, very high x dimension according to the article. Novel set up even if it might be that much better than twins. Should be lighter than twin small blocks, but probably not by much.

Re: How Fast, Y2k,staggered Big Blocks.
 

I think Fasters engine is going to last a lot longer than his Bravo XR drive... :eek:

Re: How Fast, Y2k,staggered Big Blocks.
 

Uh Huhh :D