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Replacing 1 piston, can you?

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Old Oct 13, 2007 | 03:29 PM
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Unhappy Replacing 1 piston, can you?

Hey guys I have a prob I hurt #7 piston and the cylinder wall looks fine, is it possible to change out 1 piston just to get it on the road till I can afford my $11,000 longblock I want? I have had the car sitting all summer and am tired of looking at it.

Sorry if this is a stupid question. Reason it broke I think rodbolt failure as it took out the head too!! But I can find a new head cheap so not worried about that.

Dan
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Old Oct 13, 2007 | 05:08 PM
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If the wall is fine, I say definitely go for it. You're going to have to pull the motor though.
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Old Oct 13, 2007 | 05:18 PM
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I have pulling the motor down, had it out last spring doing the cam , spring, pushrod, and intake swap. I know I didn't have to pull the engine for that but it was a lot easier with the extra room outside of the engine bay.

Dan
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Old Oct 13, 2007 | 10:32 PM
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So what kind of lesson do you have for people who want to spray 150 repeatedly?
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Old Oct 13, 2007 | 11:22 PM
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I dont think you can just throw a new piston and rings in the cyliner, on SBC's the rings would leave small ridges and waves unique to the rings, if you put a new piston/ring in the waves would crack it. But Im not sure if LSx's are differenct
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Old Oct 15, 2007 | 09:16 AM
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Well I going to pull the engine this week and bring it to a well rep engine builder and see what he says.

Dan
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Old Oct 15, 2007 | 09:54 AM
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Engine builders make money building engines so I suspect what his responce will be.

It is best to get the whole short block done but you might gamble and win!
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Old Oct 15, 2007 | 09:55 AM
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He will say what any good builder will say, do it properly or do not do it at all.
You can do a basic rebuilt: light hone, new bearings, new rings and Mahle replacement pistons.

Another option is fork out 2700 buckaroos for a forged shortblock, put it back together and mod as money becomes available.
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Old Oct 15, 2007 | 10:22 AM
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so say you change out all the pistons but want them to be the same bore do you have to get it honed even if the walls are good?
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Old Oct 15, 2007 | 11:42 AM
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If you had rod bolts let go, I really doubt that nothing else was damaged inside the block. Things move pretty fast inside and any loose metal tends to get bounced around quite a bit. With how cheaply you can get a used block, I wouldn't personally take the risk of rebuilding that block without a very good non-destructive inspection of the entire block.
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