spun main bearing in 350 block....need some thoughts - Hot Rod Forum : Hotrodders Bulletin Board
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Old 11-18-2005, 11:59 AM
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spun main bearing in 350 block....need some thoughts

I have a 880 casting block that spun a main bearing. It is a 2 bolt, but I was going to put splayed caps in it. The area in the mains where the cap goes is black and blue from the heat caused by the failure. Will this discoloring in any way hurt the block or make it weaker? I know it will be line bored, but the colr travels up about an inch or so above where the crank will be.....Thanks, Brad

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Old 11-18-2005, 12:12 PM
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Spun main bearings render a block useless. It's by far cheaper to find another block than fix a small chev.
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Old 11-18-2005, 12:43 PM
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Trash the block, it isn't worth using.

Vince
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Old 11-18-2005, 01:32 PM
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Ditto. Even if you went to the expense of saving the block. There is a good chance it will later crack in the mains from the heat that caused the discoloration.
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Old 11-18-2005, 01:39 PM
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block

I fourth it, or where ever i am in the line of getting rid of the block.....

I'll bet if you look real close at the web around that spun main you will find it is cracked all ready...

Keith
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Old 11-18-2005, 02:04 PM
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Line boreing a block is a waste of time and money. I have never done this yet with good results. Just bite the bullet and get yourself another block. Line boreing puts the crank and the cam a little closer together and even with a new timing chain and gear , the timing chain will be as loose as a worn out one.
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Old 11-18-2005, 03:02 PM
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I've got an idea,


How about getting a SHORTER chain. Hmmmmm, novel...
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Old 11-18-2005, 03:42 PM
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While I agree that the block in this case is probably trash, there are many cases in which a block with spun main bearings can be saved by align boring. As long as the block is not discolored by the spun bearing, and there are no cracks, there should be no problems with fixing it. FM even offers main bearings that are .020" over on the OD to save the blocks that are badly scored in the mains. If the mains can be saved by these methods, it can save someone a lot of money in a block that has been bored and honed, square decked and such.

BTW, Cloyes, Engine Pro and others offer timing sets that compensate for the difference in crank to cam center afters align boring.
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