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Just pulled them out of a 75k ls2. No serious marks on the cylinders that wont clean up with a light hone. They all came from the passenger side of the block. Drivers side has some scuffing on a couple pistons but nothing like this. They dont fully catch my nail, but I can feel the difference between the scuffed area and not scuffed. Thoughts?
What caused that? Sand down the intake? failed lifter? bearing? Thats not normal wear.
I've got an engine apart right now with just over 220,000 miles that looks similar to the pics but once I get them cleaned up I'll get a better idea of their condition.
What caused that? Sand down the intake? failed lifter? bearing? Thats not normal wear.
Not sure. This is a junkyard motor I got a couple months ago. The bearings all looked fine and so did the lifters. There was sand/dirt in the valleys around the smaller head bolt holes, but I didn't find any evidence of it inside the motor itself.
Im not sure if its worth it or not, but cant he just get them recoated somewhere(Swaintech, Calico, etc) and do a fresh hone?
Honestly I think piston to wall would clearance would be too big after a hone, even a light one. I've got some tools on the way so I can properly mic the bores and the pistons so we'll see.
I’d measure the wall and pistons. Call the coating co of choice and ask them how much / how thick the coatings add to the pistons and see what the tolerances are.
It's just from normal wear, I'm seeing those same marks on the top side of all the pistons. It's the rings that make most of the contact to the cylinders in the first place. If the ring wear becomes too excessive then the piston will make more contact with the cylinder thus wearing them to the point where you will need to either get them coated or replaced.
Yea the pistons are scuffing. Unfortunately its not from normal wear. Scuffing is primarily caused by overheating or insufficient clearance. But, overheating scuffing usually leaves marks near the top of the piston and lands because it is closer to the heat.
Scuffing on the lower skirt areas indicates a lubrication problem while scuffing on the edges or corners of the thrust side indicate bore distortion. Scuffing on both sides indicates wrist pin binding. Did you recently have the motor rebuilt?
If your not comfortable making the necessary measurements then the best thing to do is to have the rotating assembly and block check out by a reputable machine shop. These people do this day in and day out for a living so spend a little now or a lot later..
Then the motor at some point and maybe now has an oiling problem. It occurred either before you had it or while you owned it. It appears to be oiling because the scuffing is across the full lower part of the piston. And no you should not reuse these pistons. They are probably OE pistons and of little value. If they were an expensive set of racing pistons then they would be candidates for knurling or thrust buttons, maybe. Good Luck.
Then the motor at some point and maybe now has an oiling problem. It occurred either before you had it or while you owned it. It appears to be oiling because the scuffing is across the full lower part of the piston. And no you should not reuse these pistons. They are probably OE pistons and of little value. If they were an expensive set of racing pistons then they would be candidates for knurling or thrust buttons, maybe. Good Luck.
Well, I'm definitely not going to reuse these pistons. They aren't mine.
I guess if I were to have a point, it would be read the thread. Giving advice based on information you didn't read isn't helping.
Well, I'm definitely not going to reuse these pistons. They aren't mine.
I guess if I were to have a point, it would be read the thread. Giving advice based on information you didn't read isn't helping.
How do you think I answered the question. You asked if the pistons were usable and I answered that question. This is what you get for trying help a putz, and this conversation is over, kid.
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Would you run these pistons? 
