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Old 05-08-2013, 12:30 PM
pvmatman pvmatman is offline
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Boat: 1997 Prostar 190 with Corvette LT1
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1997 LTI Heads

Anyone have a good source for LT1 Heads? Mine overheated and blew a huge chunk out between two cylinders. I presume it cannot be repaired and that the pair should be replaced.
I plan to replace both thermostats during this rebuild. Anything else to be aware of on this motor?

Thanks
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  #2  
Old 05-08-2013, 01:31 PM
XtwentyNot's Avatar
XtwentyNot XtwentyNot is offline
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Impalassforum.com is where I would start.
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Old 05-08-2013, 02:58 PM
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CC2MC CC2MC is offline
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Originally Posted by pvmatman View Post
Anyone have a good source for LT1 Heads? Mine overheated and blew a huge chunk out between two cylinders. I presume it cannot be repaired and that the pair should be replaced.
I plan to replace both thermostats during this rebuild. Anything else to be aware of on this motor?

Thanks
Did you just lose compression? Do you know why it overheated?
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Old 05-10-2013, 04:09 PM
pvmatman pvmatman is offline
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Boat: 1997 Prostar 190 with Corvette LT1
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No clue why it overheated. Impeller is new. Will be replaceing the thermostats as part of the rebuild if I can the heads for it. Will try ImpalaSS.com.
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Old 05-11-2013, 07:30 AM
blackcreek blackcreek is offline
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This needs to get moved to engine forum. Any cylinder head shop can fix you up. The impalla SS used steel lt1 heads if I am not mistaken. You really just need to find the casting number on the head to match it up. LT-1 had steel or aluminum heads depending on make and model of car. http://outintheshop.com/faq/casting/heads.html

Last edited by blackcreek; 05-11-2013 at 07:55 AM.
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Old 05-12-2013, 10:54 PM
pvmatman pvmatman is offline
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Boat: 1997 Prostar 190 with Corvette LT1
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Thanks Blackcreek. Found the casting number and got the details from the link you provided.

Casting #12551561 350 96 2.00/1.55 Gen II LT1 angle plug aluminum reverse flow cooling.

Sorry about posting in the wrong forum. any idea how to move it to engine?
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  #7  
Old 05-13-2013, 07:39 AM
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JohnE JohnE is offline
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Originally Posted by pvmatman View Post
Thanks Blackcreek. Found the casting number and got the details from the link you provided.

Casting #12551561 350 96 2.00/1.55 Gen II LT1 angle plug aluminum reverse flow cooling.

Sorry about posting in the wrong forum. any idea how to move it to engine?
Good luck with the repair. I moved the thread.
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'97 Prostar 190 - LT-1

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Old 05-13-2013, 08:03 AM
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JimN JimN is offline
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Quote:
Originally Posted by pvmatman View Post
Anyone have a good source for LT1 Heads? Mine overheated and blew a huge chunk out between two cylinders. I presume it cannot be repaired and that the pair should be replaced.
I plan to replace both thermostats during this rebuild. Anything else to be aware of on this motor?

Thanks
I'm pretty sure that didn't overheat once and do this- it looks more like the gasket was damaged and it ran for quite a while before failing or it was at high speed. If it was only one event, it was extremely hot.

Have you removed the valves in those two cylinders? Any evidence of wear to the valve or seat? Any other areas where you see melted aluminum?

Call a speed shop.
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Old 05-13-2013, 11:40 AM
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mgs96ps mgs96ps is offline
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This post scares the pee pee out of me. Pvmatman you need to come clean and tell us the whole truth. There must have been signs and/or more to this story. Please help other LT1 owners...we need to keep this boat around as long as possible. Good luck on rebuilding of heads and keep posting.
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  #10  
Old 05-13-2013, 07:28 PM
blackcreek blackcreek is offline
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If I ever blow my original heads I am going to go with the steel Lt-1 heads. They flow just as good and will be far more forgiving in an overheat. Also, the water I boat in is not always 100 percent fresh and goes brackish at times. I will trade the extra weight for the added toughness of the steel heads in a marine environment.
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