Ski Nautique 2001 w/425HP

the broken or missing bowl in the sea strainer maybe?

I have my doubts.

stringers should be address before even touching the engine!!!

PS: Id want to see some paperwork before buying this thing at that price based on just saying its a 425 HO motor.

After staring at that motor over and over again I dont see any differences between the 454 in my boat and this one





Not even an intake manifold difference...

That's what I'm saying. There's no visible difference in my opinion. I figured it would look rare, just as much as it is rare. Sweet looking engine, Eric.

I was thinking the same thing also ken that it was an 85. Based on the interior and the dash. Good eye.

My boat is definitely cleaner but no where near as clean as your 86. Id like to be the first customer at "Kens Boat Bath"

the age old question, why did CC put a lefty in this boat? point being lefties are acceptable?

Mike also mentioned this boat to me... I believe Craig Warner (the dealer selling the boat, formerly NECC) was the one who originally installed the HO 454 in the first place. If he says its HO, then it probably is. A LH prop would be a good clue though.

Im a little surprised not to see a slightly taller intake or a dual feed carb on there. One would think that motor would require more than 650cfm to breathe. I thought all 4150/4160 carbs larger than that had the dual inlets instead of the transfer tube between the front and rear bowls.

The topic of the 454ho has come up a few times on here. PCM only published the 390hp figure as far as I know. I wouldnt doubt 425hp, as that was the common output of the GM LS6 crate motors, which I believe this motor shared a lot in common with. Basically, it consists of rectangle port heads and an intake to match, along with a decent sized cam and 10:1 compression. Im assuming that the larger cam is what made it a LH only engine. I believe most (if not all) of these engines were dealer installed- so Im not sure what the factory's stance was regarding rotation vs. hook in the hull.

Id like to drive that boat just to see how it behaves. I dont doubt it would be good for ~55mph if its a true HO though.

Greg, roller is definitely more efficient than flat tappet, and it will also allow for greater ramp angles- so they can definitely make more power... but I dont think the number is huge enough to justify dropping $2k+ on a custom roller blank. Especially at the power levels we're talking (~1hp/ci). Flat tappets can still make big power. That being said, if you go forward with that project (custom roller) then let me know- perhaps there are some economies of scale that would affect pricing on multiple cams?

I think Tim hit the nail on the head. Kinda small a carb for 425 ponies!
Currently I am building a high reving 427 with big oval closed chamber heads that will require at least a 750 CFM double pumper to feed it and it will be right at the 500 hp.
More than likely hype, is Craig selling the boat?

As far as outright performance, a roller cam won't make a huge difference over a non roller cam.

That carb does seem small and single feed w/ transfer tube seems like it really is not proper for a motor with that much supposed hp.

adamt wrote: wakeboardin2k4 wrote: Mike told me that the owner of NECC had planned on keeping that one in their personal vault and not selling it. Apparently his personal vault has a hole in the roof. Do you try to sell your car without at least running it through the car wash?!!? The condition of the rims on the trailer alone would be a deal killer for me!

   I said he mentioned that he " might " keep it. Not that he was planning on it.
   No holes in the roof over there

    Mike

I would love to see the top speed of this boat. I bet with a few mods, it would be flirting with 60MPH.

In my opinion, some buffing of the hull and some scrubbing of the interior, this will make a nice starter boat for somebody. Great conversation piece. I don't think it will last long!

I would love to hear this thing fire-up. Must have a unique exhaust tone, being a HO motor.

Ken

The best BBC casting number archive Ive found is Mortec.



Gottaski said he skied some 2001's with the HO 454. Some had regular 3" exhaust with muffs, others had straight piped 4". This one appears to have 3".



Once you start approaching 1hp per cubic inch, youre going to start needing some pretty serious (and expensive) modifications to gain large amounts of hp. To pick up the 75+ hp that would be required to push this 2001 to 60mph (as evidenced by Joe- and the BBC would have a weight disadvantage over his 408w small block), youre not talking "a few mods"... at least not simple (or cheap) ones.