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Old 06-04-2017, 12:30 PM   #21
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I'm w Ski,

Often used engines are dirt cheap.
You'll have tens of thousands left over to buy fuel and if your like most boaters you'll probably not run that many hours. And if ya do you'll prolly still be far ahead. Diesels are not as perfect for pleasure boats as most think too.
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Old 06-04-2017, 02:15 PM   #22
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I would like to maintain the same torque and/or HP that the boat came with if possible. It is shaft driven with a gearbox to mount up to.

Not necessarily all that difficult, I think. Work out what your gears are, and then work backwards to find out what engines will bolt up with not much effort. (Maybe if you can identify your gears here, engine folks could trot out some candidates...)

Then you can maybe select from among choices, guided by HP/torque for each candidate, but also guided by your wallet.

Your choices may still all revolve around the 7.4 block, but even so you could possibly improve over carburetors with MPI or some such, you could improve over raw water cooling with a freshwater system, etc. Or if some newer blocks would bolt up directly, you might be able to achieve similar HP/torgue as original and at the same time reduce some engine weight and open up some space for maintenance access.

-Chris
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Old 06-04-2017, 02:40 PM   #23
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I've run a bunch of boats with the 7.4's and with the more modern 5.7 and 6.2 (?) vortecs. To me the smallblock vortecs just seem to make dang near as much power as the 7.4's and do it with way less fuel. The 7.4 is a big torquey durable beast, but kinda piggy and inefficient.
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Old 06-04-2017, 03:30 PM   #24
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Thanks guys... all of these replies are a big reason I wanted to join this forum. I'm kinda new to all this, so learning my options is a good thing
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Old 06-04-2017, 09:19 PM   #25
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New Power

Welcome Cooperbrewer. My nephew just spent 7K freshening up his 7.4 crusaders. Boat goes like a raped ape now. His problem was finding a mobile mechanic who he could trust to not say: You need more than you actually need, to drive up my profit and your cost.
Getting an HONEST estimate from a competent mechanic of the actual condition of your engines is first step. Then a combination of either you or the mechanic searching for one (or two as needed) new long block, short block or rebuilt swap that would fix you.

Without knowing the actual physical condition of both engines you are just throwing darts. Get a good estimate. It will cost money to have a mechanic to inspect. It then you know what you have to start with.

Just to get an idea go on EBay and search for crusader 7.4 long block. Either rebuilt or offering to rebuild one. See what they are going for.
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Old 06-04-2017, 11:47 PM   #26
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The Cooper Prowler is a nice planing hull boat. A good friend of mine has one and they love it. You are not going to be able to replace those gas engines with diesels and have the same kind of performance very cheaply. If you want to keep the boat then repair/replace the big blocks with like engines and go enjoy the boat. If you want a slower diesel-powered boat then repair/replace the big blocks with like engines and sell that boat and then buy the boat you really want.

Marty............................
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Old 06-05-2017, 11:59 AM   #27
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Thank you, everyone! Again, I am glad I joined, and you've all been quite helpful. I think I will check around again for a good reliable and honest mechanic to possibly assess what I have first (maybe one or both are rebuildable) I will compare this cost, with used (fresh) or already rebuilt motors and having them installed.
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Old 06-05-2017, 12:00 PM   #28
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I'll keep you all posted with the progress
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Old 06-06-2017, 04:44 AM   #29
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"(maybe one or both are rebuildable)"

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Old 06-06-2017, 07:23 AM   #30
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With my modest mechanical skills I have replaced stern drive gassers in my driveway. It is amazing how cheap a new Mercruiser 350 or 454 carb gasser is, but first - what is the current problem?
I had a 454 in my Sea Ray. It is actually one of the reasons I got rid of that boat. Not only was she a gas guzzler, but needed a rebuild. I had it hauled out of the boat and put in my garage. Even bought an engine stand for it, (for sale now).

I was fortunate to be able to rebuild it myself with the help of some very knowledgeable friends. I never knew who was going to be over my house tinkering. Took over a year and a lot of money.

I would never ever own another one again. I should have refit at the time. Boat was sold last year and I'm sure she is enjoying her freshwater life now.
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Old 06-06-2017, 06:56 PM   #31
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For a pleasure boater that already has 454s, rebuild/replace in kind. Crusaders are great engines. Last longer and perform better than the "nothing but diesel" folks care to admit.

FF's recommendation re: Jasper is spot on.
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Old 06-06-2017, 07:25 PM   #32
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For a pleasure boater that already has 454s, rebuild/replace in kind. Crusaders are great engines. Last longer and perform better than the "nothing but diesel" folks care to admit.

FF's recommendation re: Jasper is spot on.
I agree.... I've had them in past boats and have one in my 23' center console. It's bullet proof.
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Old 06-06-2017, 08:40 PM   #33
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I'm not sure I would agree with an outboard / pod option being less than a 7.4 replacement or fix. Long blocks can be had for 3-4K.
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Old 06-06-2017, 11:54 PM   #34
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First find out what's wrong with the non running engine.
Almost every city or port of any size has an engine rebuilder. Most will be way less than the prices I see here. The big expense is pulling the engine and reinstalling. Going to different engines creates other problems. Right now everything fits and hooks up.
If you were in my territory, I know qualified mechanics who would rebuild for under 5Gs and we don't even know if the current engine is fixable as is.
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Old 06-07-2017, 09:53 AM   #35
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The challenge with rebuilders is that many are automotive specialists, and do not realize that a marine engine has a different operating profile than one ran on the road.
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Old 06-08-2017, 05:21 AM   #36
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"The challenge with rebuilders is that many are automotive specialists, and do not realize that a marine engine has a different operating profile than one ran on the road."

Perhaps this is a hassle at local shops , but the big pros are happy o provide marine builds or HD truck gas engines.

They have the proper cams and salt cooled valves and HD valve guides for higher HP long term output.
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Old 06-08-2017, 07:20 AM   #37
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Another advantage of replacement or full rebuild -- i.e., with engines removed from boat for a while -- is the a serious detail cleaning of the engine room and bilges and so forth is much easier. And that in turn can improve overall odor, mildew, goop control, etc.

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Old 09-14-2017, 02:04 PM   #38
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Update: Today a local machine shop is on the rebuild of the engine I have out of the boat. They said a couple weeks and it'll be done and ready to reinstall. Now I just have to find someone to do the installation
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Old 09-15-2017, 05:30 AM   #39
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"They aren't going to last as long, but you get a much lower initial cost at purchase."

A modern gasser with fresh water cooling should last about 4,000 hours , depending weather there run for cruising or at WOT most of the time.

At 200 hours a year for the usual pleasure boat use , that's a lot of years.
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Old 09-16-2017, 02:58 PM   #40
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I believe the boat is set up for RWC or sea water cooling. I don't see any heat exchangers or tanks.

I thought about fresh water conversion, but I'm not sure it's worth it???
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