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Old Mar 7, 2019 | 09:34 AM
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Bad News

i purchased a motor to rebuild and replace the one in my truck. Machine shop called and said it’s gonna have to be bored .040 to get passed the pitting. Is this even possible?
I not sure if I want to be this financially invested if I can go another route.
 
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Old Mar 7, 2019 | 09:43 AM
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Eeewww.... I don't think you can get oversize pistons past .030 over. That's no bueno...
 
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Old Mar 7, 2019 | 09:52 AM
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some engines can be bored out to .100 over before being sleeved

If the walls are n good shape then I don't see an issue.
 
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Old Mar 7, 2019 | 10:57 AM
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Mahle has a 40 over piston for the 7.3
 
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Old Mar 7, 2019 | 11:37 AM
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Well, there you go! I stand corrected.
 
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Old Mar 7, 2019 | 11:44 AM
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If I go 40 over, is there anything I need to do to the heads?
 
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Old Mar 7, 2019 | 12:00 PM
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Also, would it be advisable to go that far? Just because they make a .040, doesn’t mean it should be done. I don’t want to sink a lot of money into the motor and it not last.
 
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Old Mar 7, 2019 | 12:39 PM
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If it’s a daily driver and you don’t plan to make 400+hp then it’ll be fine.
Me personally I wouldn’t do it.
 
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Old Mar 7, 2019 | 01:26 PM
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Thanks for all of the replies. Decided to have all 8 cylinders sleeved.
 
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Old Mar 7, 2019 | 03:19 PM
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I'd go .040 over before I sleeved all 8. That's a costly and scary idea. Dont do it. Personally I'd find a different block.
 
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Old Mar 7, 2019 | 06:14 PM
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Where are you located?
 
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Old Mar 7, 2019 | 08:25 PM
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If you do sleeve it make sure they lip the block so the sleeve can’t be pulled down.
 
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Old Mar 7, 2019 | 08:26 PM
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His profile show TX.
 
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Old Mar 9, 2019 | 10:35 PM
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Have you looked at the bores yourself? I’m curious about deep “pitting” in all 8 cylinders. I could understand a lot of wear if it’s a high mileage block, but I’m not sure about pitting. What does it look like and I wonder what caused it? Usually always good to see for yourself even if your machinist is top notch.
 
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Old Mar 13, 2019 | 09:11 AM
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I purchased the motor that was removed from a wrecked truck. When they removed the motor, they removed the valve covers and injectors. They had it covered and sitting outside. Over time the cover tire and came apart, leaving the holes where the injectors were, exposed to the weather. After I removed the heads, I removed all the mud, filled the cylinders with tranny fluid. Still took about 3 days to get the motor to turn over freely. When I tore it completely down, all of the cylinders were in need of work. But, I thought that only one of them would need sleeved, that the others might hone out.
Lesson learned. This is my dream truck, so it isn’t going anywhere. For what I’m going to be into it for, I could have just bought a short block. But, too late to turn back now.
 
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