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Engine Stamp Question

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Old Jan 18, 2022 | 12:16 PM
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Default Engine Stamp Question

The engine stamp on my 66 coupe is covered in orange factory paint that makes it difficult to read all of the numbers. Below is a picture of a stamp that has had the paint removed. What is the easiest and most advisable way to remove the paint from my engine so it that is easy to see the numbers like below?


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Old Jan 18, 2022 | 12:23 PM
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Any chemical like paint remover, lacquer thinner, acetone and alike products. Never use any abrasives
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Old Jan 18, 2022 | 12:32 PM
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Originally Posted by Nowhere Man
Any chemical like paint remover, lacquer thinner, acetone and like products. Never use any abrasives
It will most likely take several applications of the above products. Soak a cloth and use LOTS of elbow grease. Again...NO ABRASIVES!!
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Old Jan 18, 2022 | 01:49 PM
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IIRC, the factory did not paint over the stamp pad. So any paint on that pad was added later.

But yeah, use acetone, take your time, and use no abrasives, not even a hard bristle brush.

What you want to be able to see is the original engine factory broaching machine marks on that stamp pad. Any abrasives can remove those marks.

Since original broach marks are nigh impossible to replicate, having them intact is key to validating your pad's stampings.
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Old Jan 18, 2022 | 02:35 PM
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Use a Q-tip or small soft bristle brush to get the paint out of the number indentations after you get the overall pad surface clear. Don't use an icepick or anything sharp.
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Old Jan 18, 2022 | 02:44 PM
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Originally Posted by LuckyGuy
The engine stamp on my 66 coupe is covered in orange factory paint that makes it difficult to read all of the numbers. Below is a picture of a stamp that has had the paint removed. What is the easiest and most advisable way to remove the paint from my engine so it that is easy to see the numbers like below?

Did you mean to type 65 coupe? HN was used in 65 for a Fuelie plus the pad stamp begins with a 5.
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Old Jan 18, 2022 | 03:00 PM
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This is not a picture of my engine - it is from a '65 fuelie.. My car is in storage for the winter
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Old Jan 18, 2022 | 03:00 PM
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On our unrestored 66 300 HP the stamp pad was painted at the factory. No idea what was done on others.
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Old Jan 18, 2022 | 03:06 PM
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Originally Posted by Mark in MN
On our unrestored 66 300 HP the stamp pad was painted at the factory. No idea what was done on others.
No offense intended but were you the original owner?
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Old Jan 18, 2022 | 03:14 PM
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This is my car - L79 under the hood




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Old Jan 18, 2022 | 03:59 PM
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Originally Posted by LuckyGuy
This is my car - L79 under the hood


Damn, that's stunningly beautiful.
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Old Jan 19, 2022 | 12:48 PM
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Originally Posted by Easy Rhino
Damn, that's stunningly beautiful.
You really need to Wash this Bad Boy!!! NICE!

Glad I could contribute............
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Old Jan 19, 2022 | 04:29 PM
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Nice! Dennis
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Old Jan 19, 2022 | 04:32 PM
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Originally Posted by dcamick
You really need to Wash this Bad Boy!!! NICE!

Glad I could contribute............
Actually you could really contribute by having that gal in the bikini pop by my house sometime
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Old Jan 19, 2022 | 10:46 PM
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Originally Posted by Easy Rhino
IIRC, the factory did not paint over the stamp pad. So any paint on that pad was added later.
This is absolutely true. The pad was not painted by the engine shop or the assembly line.
For most serious restorers, engine paint is one of those things where abiding with Chevrolet's process can cause some serious dedication to the restoration wobbles. Engine paint only had to look good enough and new enough from 5' away until the car was sold.
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Old Jan 20, 2022 | 06:49 AM
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Originally Posted by 67:72
This is absolutely true. The pad was not painted by the engine shop or the assembly line.
For most serious restorers, engine paint is one of those things where abiding with Chevrolet's process can cause some serious dedication to the restoration wobbles. Engine paint only had to look good enough and new enough from 5' away until the car was sold.
I'm confused. Who would have added the paint and why?? And are you saying that the orange paint on the engine was somehow carefully applied so that it did not cover any part of the engine stamp??
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Old Jan 20, 2022 | 07:35 AM
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It was not carefully applied. Probably had a piece of masking tape crudely slapped on it or the painter may have had a piece of cardboard he used as a mask to cover it when painting. If the car was ever sold in its early years and went through a car lot, it was pretty standard to steam clean the engine and then a detailed would do a quick once over of the engine block/heads,intake with a light, partial coat of paint, radiator top, inner fenders, etc to make it present a little better. I’m not sure what they used to paint with as sometimes the detailing was amazingly fresh looking - maybe air brushes. Could have got a shot of paint on it then. Also could have been an earlier owner who didn’t like that rusting stamp pad and gave it a quick shot of Chevy orange himself.
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Old Jan 20, 2022 | 08:14 AM
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Related to this question, how do you remove surface rust from the stamp pad without damaging the pad?


It’s gotten a bit worse than this now.
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Old Jan 20, 2022 | 09:06 AM
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Probably a careful application of a rust treatment gel like Navel Jelly. But it will attack paint so have dab it on carefully. I suspect it will still leave a stain though.
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Old Jan 20, 2022 | 09:22 AM
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Thanks, Dan. I’m actually more worried about the broach marks and screwing up the originality. Naval Jelly is a good choice. Some rust removers contain phosphoric acid which can turn the area black, but I believe NJ is a very low concentration of acid and may not. I also like how thick it is which helps keep it in one place and off the paint.
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