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Here's a better angle.

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THAT is what "scuffy cookie" damage looks like!!

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At this point it looks like .005 more will make it flat, so a little change on the feed and speed for a proper finish and voila.
Just for the record, the customer was replacing the short block, cleaned up the head and bolted it on, only to find he now had water in the new short block. Hmm, I wonder why. After he saw first hand the damage he did he swears he'll never use a roloc disc again, ever.
I figure what the heck, it's only money, right?
Anyway, like I said before, I see this all the time. It's not like these are isolated incidents. Your results may vary.

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Dan, if you can convince these guys to not use the 'cookies',,can you get them to keep their pants pulled up where their underwear doesn't show, put their hats on straight, and not waste their engine $$$$$ on tatoos???

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At this point it looks like .005 more will make it flat, so a little change on the feed and speed for a proper finish and voila.
Just for the record, the customer was replacing the short block, cleaned up the head and bolted it on, only to find he now had water in the new short block. Hmm, I wonder why. After he saw first hand the damage he did he swears he'll never use a roloc disc again, ever.
I figure what the heck, it's only money, right?
Anyway, like I said before, I see this all the time. It's not like these are isolated incidents. Your results may vary.

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Dan, if you can convince these guys to not use the 'cookies',,can you get them to keep their pants pulled up where their underwear doesn't show, put their hats on straight, and not waste their engine $$$$$ on tatoos???

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Sure, just point them out.

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I have a 6.1 head that some moron did that too. He figured "hey at least the carbon is gone"......does anyone need a 6.1 head too practice on?

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Yeah, it alway's looks like that on aluminum.
I hope nobody takes this the wrong way, but those cookies sure do help my bottom line.

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At this point it looks like .005 more will make it flat, so a little change on the feed and speed for a proper finish and voila.
Just for the record, the customer was replacing the short block, cleaned up the head and bolted it on, only to find he now had water in the new short block. Hmm, I wonder why. After he saw first hand the damage he did he swears he'll never use a roloc disc again, ever.
I figure what the heck, it's only money, right?
Anyway, like I said before, I see this all the time. It's not like these are isolated incidents. Your results may vary.

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Dan, if you can convince these guys to not use the 'cookies',,can you get them to keep their pants pulled up where their underwear doesn't show, put their hats on straight, and not waste their engine $$$$$ on tatoos???

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good luck
You ask one why and they'll tell you "It's the way I choose to dress, I'm not copying ANYONE! I'm unique"

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Yeah, it alway's looks like that on aluminum.
I hope nobody takes this the wrong way, but those cookies sure do help my bottom line.

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What do you suggest using to clean a head and block whether iron or aluminum for a head gasket change.

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Here's a better angle.

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THAT is what "scuffy cookie" damage looks like!!

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THAT is a better example.

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Definitely interesting information!

Here's an idea...

Maybe one of the guys who claim that only idiots and amateurs are causing damage with abrasive rotary pads, and that it can be done safely without damage to metal... Should send an example of their work in for inspection with the blue dye and a 'kiss' from the decking machine to check their work.

Kind of a 'put your money where your mouth is' proposal.

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I've had plenty of people over the years tell me they were real careful when they removed the gaskets with a die grinder and a roloc/scotchbrite type pad. They're usually pretty shocked at what shows up on the surface.
It doesn't matter how careful you are, they all remove metal and some are worse than others. Every type I've ever seen will round corners before the flat area's are free of the gasket. If that flat area is between the cylinders or combustion chambers, the pictures I've posted will prove what I just said. Some people even think they're making the surface better because it looks smooth and shiny when they're done.
When the pads are new, they're very aggressive and cut a trough, after the pad starts to wear and become more flexible, people have to press down harder and use more of the middle of the pad,. that's when the corners or edges start to get rounded off. Again, that's usually a cylinder wall or a combustion chamber or a water jacket, etc.
In any case, they're a great tool in certain situations, but not good at all when it comes to cylinder heads or engine block deck surfaces.
In the case above, that head had to be cut .045" to be flat and a head saver shim was ordered to correct the height back to normal. Fortunately the shim was available or the head would've needed to be replaced.
The way I see it, Our favorite Mopar engine blocks are starting to dwindle down. They only made just so many and when they're gone, we'll be looking for them in just about any form so we can build another engine to our liking. Don't destroy what we have left for the sake of a little elbow grease or a little extra time and care simply to remove some old gaskets. It's bad enough those factory blocks look like they were machined with a stone axe, don't make it any worse, please.