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Engine Technical Discussion This is our non outboard engine related technical discussion forum. If your boat is powered by a Inboard/Outboard, Jet drive, V-drive, or even something else, then this is the forum for you! Topics include engine repair and maintenance, modifications, drives and gearcases, electrical and electronics, etc. For technical assistance related to outboards, please use our outboard tech forum.

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Old 03-25-2017, 09:03 AM   #1
Nick616
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Default Repowering 253 Convincor

Well it turns out my "Tired 502" ( another thread on this forum ) was actually a frankensteined 454 block with a 502mag sticker on the intake . . .

Given all the other issues with the motor and other mis-matched / obsolete /unknown parts its time for all new power.

I'm looking at a Certified Pre-Owned 8.2 MAG ( 380Hp ) or MAG HO ( 430 Hp )

Leaning towards the HO - if I'm going to drop 15k into an engine might as well spend another $2500 for the extra 50 HP.

I'm primarily a pleasure boater that likes to go fast - I just want a solid engine that I don't have to mess with / worry about.

Any other suggestions / advice / problems to watch for?
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Old 03-25-2017, 09:15 AM   #2
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What about the ZZ502 or 572 from GM or Blueprint motors out of Summit? Probably need marinized but probably around same price point bang for the buck...
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Old 03-25-2017, 12:36 PM   #3
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Go big: http://www.whiteperformance.com/engi...540-667hp.html

Turn key drop in: http://www.michiganmotorz.com/mercru...ve-p-1059.html
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Old 03-25-2017, 09:00 PM   #4
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What about the ZZ502 or 572 from GM or Blueprint motors out of Summit? Probably need marinized but probably around same price point bang for the buck...
I don't want to deal with Marinizing the engines - plus if/when I sell the boat would prefer to have a "stock" Mercruiser engine.
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Old 03-25-2017, 09:04 PM   #5
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Going big would be about the same $ - until all the upgrades needed to handle the HP - plus I'm sure I would break something ( outdrive ) "having fun" with that much power . . . .

Michiganmotorz is pretty much what I'm planning on, other than a HO CPO for about the same $.
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Old 03-26-2017, 04:47 PM   #6
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I run the new style mercruiser 8.2 and haven't had any issues. Whipple offers a pcm tune for about $900 that will met you some serious gains.
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Old 03-27-2017, 05:54 AM   #7
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There are some reputable guys dealing in refreshed Mercury power as well. I have seen them selling fresh hp500's for less than $10,000 and 500EFI's for less than $15,000. Those would bolt right in, you wouldn't have to upgrade your drive and nothing increases the value of a boat more than having a Merc Racing blue motor under the hatch. I'd just hate to see somebody spend $15,000 on their boat and only get 435hp.

Another route you could go would be to call someplace like Kunkels Marine. They aren't to far from you and they usually have some nice take outs for sale. Not sure if they still have it, but at one time they were selling a Procharged 496HO with like 30 hours on it for something like $9000. They are a very trustworthy company too, just ask around on here and you will see that they have an impeccable reputation.

Just throwing some other options out there for ya. I hate to see people spend more than they have to.
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Old 03-27-2017, 10:09 PM   #8
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Quote:
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There are some reputable guys dealing in refreshed Mercury power as well. I have seen them selling fresh hp500's for less than $10,000 and 500EFI's for less than $15,000. Those would bolt right in, you wouldn't have to upgrade your drive and nothing increases the value of a boat more than having a Merc Racing blue motor under the hatch. I'd just hate to see somebody spend $15,000 on their boat and only get 435hp.

Another route you could go would be to call someplace like Kunkels Marine. They aren't to far from you and they usually have some nice take outs for sale. Not sure if they still have it, but at one time they were selling a Procharged 496HO with like 30 hours on it for something like $9000. They are a very trustworthy company too, just ask around on here and you will see that they have an impeccable reputation.

Just throwing some other options out there for ya. I hate to see people spend more than they have to.
I cannot say enough good things about Kunkel Marine and especially Jason Kunkel. If they have an engine available you can count on it.
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Old 03-27-2017, 10:16 PM   #9
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Jason Kunkel was great to work with. If you spend some time looking there are good deals out there. I bought a low hour 600sc for 7k. He wanted 9 originally but settled for 7k. A guy named Mike Mello always has several used engines on hand over on Checkmate boat owners facebook page.
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Old 03-28-2017, 04:51 PM   #10
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Default Thank You

Thank you all for the great advice. Ended up going with the 430Hp CPO 8.2L - a little more than I really wanted to spend, but after going through the whole chasing gremlins for a summer and missing many of the few great days on the lake I think it will be worth it - peace of mind is worth it to me at this point.

Hopefully all I will need to do once it's installed is get the proper prop - I'm sure the 21P won't be big enough

I will post pics / updates as available.

( Anyone interested in what appears to be mostly a 454 HO MPI engine in pieces with a 502 Intake manifold sticker . . . . )
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