Oh no that doesn’t sound good what happened did they end up leaking ?

https://cimg3.ibsrv.net/gimg/www.off...008a29643.jpeg
Let the fun begin ( o wait it has been going on for a year )
https://cimg6.ibsrv.net/gimg/www.off...b77940413.jpeg
Cutting them in half to remove
https://cimg9.ibsrv.net/gimg/www.off...50e86b5a3.jpeg
One out
https://cimg2.ibsrv.net/gimg/www.off...41155ab0e.jpeg
Getting rest of fuel out
https://cimg9.ibsrv.net/gimg/www.off...c9ddec4e3.jpeg
Fuel tank stringer cut some glass off to see condition. Replacing them all.
https://cimg5.ibsrv.net/gimg/www.off...2ff468b4b.jpeg
Tanks had some Corrosion on the bottom of them
https://cimg8.ibsrv.net/gimg/www.off...d8986577d.jpeg
Finally getting there

Got off work at 7am this morning came home and started on getting tanks out. Spent all day and all evening on it came inside at 9pm lol was a ton of work had to drain them then cut the top off and finish getting all fuel out. Then took a saw all to them and the grinder with cut off wheel. Cut them into pieces and then tore them out. I can’t believe how hard they were to get out that foam had them sucked in placed really good. Hopefully this week I can continue to get it all clean and ready for new stringers.

https://cimg2.ibsrv.net/gimg/www.off...4f2a13847.jpeg

You're a hard working man.

Dude, I thought I bust azz at home.... I goitta stop in this week and see this thing lol

Lol well I definitely keep busy on it in my off days if I don’t this thing will take years to do lol I’m lucky with my work schedule I’ work one day then off for three so I can get a lot done

Good god you are crazy. :lolhit: But great work!!

Logistically challenging task

Lol well I may be crazy bit that’s ok cause when she’s done I’ll know it’s solid and better then when it left the factory. No cabin liner to move around under nasty lake conditions less weight a bit more speed and I think the most time consuming part will be the rewire. But seems a lot of these 30 year old boats have had a few peoples hand in the wiring it’s sub par at best with several things that could burn it down at any given time. It will be updates to all smart craft and it will take time. But good news is Lake Erie is going to dry up anytime soon my shop is heated and I have a fully stocked fridge in the shop what more could one want 😂😂😂😂😂

not really, he already has it on yardarms, only needs a gantry and strapping.

re-wiring is way better than the cabin glass work.

Preach on brother.............I'm 3 years into mine.

been there done that as well

one thing I love about mine is nobody ever touched anything with wiring besides adding MSD boxes and even that was done right, everything else was factory down to the 1987 cassette player! Everything works too which is amazing

one owner for 29 of its 32 years helped that a ton

be too old to use it soon lol

Lol yes you keep keep telling me that. Give me 10 min in there with a drill and wire snips I’ll find something for you to work on lol.

Lol someday!!

Ok since I’ve pretty much made this boat a hot rod know the goal is to make it as fast as possible and as reliable as possible for engine we took the 575 sci and had heads all redone and have long blocks done. I really wanted to build twin turbo engines but everyone has talked me out of it they say it will be very hard to get it correct. So sticking with blower engines. Do you guys think think the 8-71 is a good choice ? And if so what do you think about the throttle body injection I’m leaning towards going to carbs as the engines will make for power with carbs any thoughts ?

I've enjoyed watching your progress and look forward to seeing it done! Have you looked at fuel injected Whipple setups?

I'll never go back to a carbs, the reliability of a properly tuned efi is 100% worth it. your limiting factor will be your drives. i think with a stout long block and a whipple 3.3 you could be 850 plus... my 509s are at 850 right now with 4.0 liter whipples, and its been a dream. im going with smaller pulleys and a more precise tune and taking them up to 1000. they do have efi with throttle bodies for roots style blowers that can be run with a holley fast system.

Eric, Look at what Dan "ICDEDPPL" did with his. The Holley setup looks fantastic, the tech is figured out, and relatively easy to install. He makes really good power with 10-71s??? (I may be wrong here)

I think 5 years ago this was a bigger concern, but now the technology has caught up, price has come down a little, and reliability is good. Seems like less of a frankenstein / tech experiment and more plug-n-play.

One thing I do not prefer with carbs is how much fuel they have to run on a bigger blower setup. With the newer fuel injection setups, fuel management & tunability is a big benefit. If you're going thru all this, "why not" go fuel injection?

I was going to mention this also, he dropped some coin doing this conversion and turned out great

https://www.offshoreonly.com/forums/...nture-6-a.html

I really do love the efi stuff and lives my 575s. Everyone just says it’s a limiting factor and the stick injection can’t hand over 700hp. I lave a bigger cam and with 871 blowers I would imagine I could make over 700hp? Mabye just keep the stock stuff ?whipple stuff a little out of my price range at 10k per moter I have a ton of other things that came up in the build as we all see lol. I’m going to look into that holly stuff. I’ll reach out to dan and see what he says.

Dan is running bigger power, 900hp? The Holley EFI stuff replaces a carb setup. I doubt it has limitations untils you get over 1,000hp? I'm not well versed, reach out to Dan. I do not think it was $10K/motor....

https://cimg5.ibsrv.net/gimg/www.off...87b28eb42f.jpg
Holley EFI.

Money well spent

I think I the holly stuff will support a ton of hp. My stock injection has limits tho. I think the limit is around 700 ho on the stock throttle bodies. On the Holley stuff what the best places to purchase from and get info from ?

I was quoted 10k each for make it work on my 725s. that's why the motors have carbs lol

Looks awesome! How much power and approximate cost please?

Yes seems carbs are way cheaper carbs are about 700 new so that 2800 for all 4. I have all the original 575 efi just don’t know how much power will be left on the table with them .

I know ICDEDPPL and it looks like kvogt are running crank trigger and coil on plug so there's more to the cost than just the EFI

dan spent a lot to make it perfect but works, it’s really about cost at the end of the day both can work well just a matter of money.

Eddie young makes an injector plate for 575s that can support a lot of power. He can tune your ecm as well. He’s probably done enough to get you really close with a tune he already has.

8-71 swapped 575s have been done and can make really good power. Like up to 900 if you lean on them. 800+ is typical

No reason not to do it this way when starting from a 575


https://www.offshoreonly.com/forums/...ml#post4417235

lots of people were taking their 575s once the manifold went bad and put on 871s, you could do that as well and switch to the holley system and be at a real reliable 800 with efi, and be in it for the cost of the blowers and system. then sell your 575 stuff to offset the cost.

Yes I was thinking that to I can order the 8-71s that’s not a problem I have my blowers sold already just don’t want to spend a extra 10k per moter on efi. I did talk to Eddie today. His is 2k per moter and he said about 1000 to tune and get it correct. So that’s about 3k a side. I’ll have to keep thinking. And figure out the most cost effective solution.

Check with Frank Ungarten, he goes by panther on here, he has a 36 apache and is doing the tuning on my boat.. he is very good with tuning EFI.

Thanks !!

https://cimg0.ibsrv.net/gimg/www.off...3b3afc0916.jpg

What was the total per moter for that set up ?

I would never go carbs again. Really when I went from car stuff to boating I didn`t understand why boaters are using 1970s tech but I got used to carbs and kinda like em now . nothing wrong with carbs but it`s old tech .

I ordered everything from Alex Haxby, it included tech support and a base tune.Alex is great guy and great to deal with.
The above will run about $8k. Fuel pumps and misc. a few bucks more ... on the high high end you`re at $10k . That`s going coil/plug which you don`t have to do.
$10k minus $3500 for my Daytona ignition, fuel pumps, quick fuel carbs . Thats $3250/ engine
$1500 in tuning
I`m not including the 7" screens or EFI mechanical gauges.
Throttle bodies I got are good for 600hp each , I have 2/engine. I think probably around 1000 hp is the limit as I`m running 85% duty cycle on the injectors@43psi. raising the fuel pressure will help that .

I`m making 973hp in full trim.

It is not plug and play does take some time figure out .
I had to move a few sensors that are in the throttle bodies down below the blower.
IAT and MAP come to mind.
The two IACs had to be rewired to operate in series.

Gas savings are significant .
No more soot on transom , no fouled out plugs.
Idle is excellent. Transition from idle to in gear was a ***** and took 2 days to get right , partly because my tuner is a car guy and it too time to figure it out . In the end it was all timing and limiting the learn feature below 1500rpm.
Guardian mode is what really nice.
You can set up all kinds of parameters , for example if water pressure falls below a certain pressure , or oil temp is too high .etc it will automatically limit rpm to 2500. (Don`t have to watch every gauge while running)
Might save an engine and then it`s worth every pennie.


Holley is always improving, they have this option also :

https://www.holley.com/products/fuel.../parts/550-531