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Old 01-09-2018, 08:54 PM
96sammyd 96sammyd is offline
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Boat: 1996 Mastercraft Prostar 205 5.7 Indmar
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96 Prostar cracked block

Hi guys,
I have a 96 prostar 205 Sammy Duvalle. I took it in to get some work done well they noticed a crack around the plug. They called wanted to make sure it was ok to hook it up run it... well now we have chocolate milk oil. So it has a 5.7 Indmar engine, what the best option??? I havn't heard good things about Jasper? Can I buy a chevy truck motor and transfer the marine parts over? I know of a Chevy truck rebuild able block, Is that an option? Or do I have to go marine block? any thoughts are welcome Thanks!
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  #2  
Old 01-09-2018, 09:34 PM
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1redTA 1redTA is offline
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yes, use the same block and exchange the marine specific parts
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  #3  
Old 01-09-2018, 09:49 PM
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CruisinGA CruisinGA is offline
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Look at Michigan Motorz
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  #4  
Old 01-10-2018, 08:18 AM
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Maristar210 Maristar210 is offline
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^^^^^ I second
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  #5  
Old 01-10-2018, 09:21 AM
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tjrowbot tjrowbot is offline
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If you can swap the block yourself 100% agree with the two above. I have heard nothing but great things and they rebuilt a neighbors 5.7 Predator.
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  #6  
Old 01-10-2018, 05:25 PM
mikeg205 mikeg205 is offline
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you wrote - well now you have chocolate milkshake oil?? did you before you took it in?
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Old 01-10-2018, 08:41 PM
96sammyd 96sammyd is offline
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Boat: 1996 Mastercraft Prostar 205 5.7 Indmar
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Thanks for the information guys. No it was not like that before i took it in. They said when they got it the checked the oil it looked a little high on the dip stick but once they ran it, it then turned to cream color
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Old 01-10-2018, 10:19 PM
Cumminscj Cumminscj is offline
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Was the boat properly winterized? If so and it was done before you took it in I would be looking for second opinions.

If it is truly cracked I would get a block and get everything swapped over. Use appropriate freeze plugs and gaskets. I would probably have a machine shop check the heads out a do a valve job. Or at the very least lap the valves yourself and replace the seals. I know my machine shop would build the engine for me for around $2,500. I currently have them doing a friend's engine I don't have time to build. I sourced a couple used LT1 blocks for my 205 with and LT1 for $150. Bought the boat as a project due to the cracked block. Plenty of options out there depending on your skills and how much time you want to invest
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Last edited by Cumminscj; 01-10-2018 at 10:20 PM. Reason: Typo
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  #9  
Old 01-11-2018, 08:35 AM
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I had Michigan Motorz replace mine with a new long block a year ago. Good people.
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  #10  
Old 01-11-2018, 09:42 AM
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Quote:
Originally Posted by 96sammyd View Post
Hi guys,
I have a 96 prostar 205 Sammy Duvalle. I took it in to get some work done well they noticed a crack around the plug. They called wanted to make sure it was ok to hook it up run it... well now we have chocolate milk oil. So it has a 5.7 Indmar engine, what the best option??? I havn't heard good things about Jasper? Can I buy a chevy truck motor and transfer the marine parts over? I know of a Chevy truck rebuild able block, Is that an option? Or do I have to go marine block? any thoughts are welcome Thanks!
I used Jasper after going through the tour of their factory- never had a problem. As long as the rest of the components are in good condition, you could search for the same engine (look behind the bell housing for the casting numbers) or find a good used engine that matches.

If the crack isn't too long, I know of people who ground a groove and applied JB Weld- never had a problem, either.

Make sure to use marine gaskets if you rebuild.
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