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[C1] Casting flaw in aluminum valve covers

 
Old 03-12-2019, 10:09 PM
  #21  
Willcox Corvette
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Originally Posted by leif.anderson93 View Post
Paragon Reproductions
While I'm not sure... yes Paragon is the supplier of the covers without the flaw.... However, I believe they are just working out the casting mark in the O... While I have my original covers on my 62 without the flaw, I do have a set of the Paragon covers without the flaw on clearance on eBay.. https://www.ebay.com/itm/132959399571

i've not opened their boxes and I've not compared them to my original covers but I've also not had any complaints registered in our system on this part number.

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Old 03-13-2019, 07:48 AM
  #22  
Frankie the Fink
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IIRC I sold two sets of no flaw late-59 to early-66 aluminum covers for $125/pair 5-6 years ago when I sold the 61...
You would still run across them at swap meets occasionally back then, this year at Lakeland I don't recall seeing any...

Last edited by Frankie the Fink; 03-13-2019 at 11:12 AM.
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Old 03-13-2019, 09:38 AM
  #23  
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Originally Posted by Frankie the Fink View Post
IIRC I sold two sets of no flaw 58-early66 aluminum covers ...
I figured my post above is invisible so I'll ask here, what s/n or date is the early/late cut-off? Thank you
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Old 03-13-2019, 09:46 AM
  #24  
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1958 is not one of the magic numbers.

Last edited by MikeM; 03-13-2019 at 09:48 AM.
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Old 03-13-2019, 10:58 AM
  #25  
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Originally Posted by cor66vette View Post
I figured my post above is invisible so I'll ask here, what s/n or date is the early/late cut-off? Thank you
There's no magic date or serial number that's precise. Flaw started showing up on cars roughly around the middle of March 1966.
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Old 03-13-2019, 11:12 AM
  #26  
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Originally Posted by MikeM View Post
1958 is not one of the magic numbers.
You are right - I corrected my post...thanks.
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Old 03-13-2019, 01:45 PM
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Originally Posted by Frankie the Fink View Post
You are right - I corrected my post...thanks.
I thought Ernie might want to correct his Ebay ad.
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Old 03-14-2019, 06:35 PM
  #28  
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Originally Posted by MikeM View Post
I thought Ernie might want to correct his Ebay ad.
Mike.. I'm not sure what the error was, I always thought the late 58 cars had the standard screw holes like the 59 and later cars. Either way, the covers were sold today....
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Old 03-15-2019, 02:12 PM
  #29  
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Originally Posted by Willcox Corvette View Post
While I'm not sure... yes Paragon is the supplier of the covers without the flaw.... However, I believe they are just working out the casting mark in the O... While I have my original covers on my 62 without the flaw, I do have a set of the Paragon covers without the flaw on clearance on eBay.. https://www.ebay.com/itm/132959399571

i've not opened their boxes and I've not compared them to my original covers but I've also not had any complaints registered in our system on this part number.

Willcox
My understanding about the flaw/no-flaw issue and the reproduction situation is this:

* GM had only one mold for the later-style aluminum valve cover
* In mid-1966, that mold developed a crack that created a flaw line through the "O"
* Paragon purchased the GM mold and uses it to make all of their reproduction valve covers of the late style
* To create a no-flaw valve cover, Paragon carefully machines the flaw line away

I've seen examples of the re-worked covers and they look pretty good, at least to a casual observer. I suppose that in NCRS judging, the judges look very closely and can probably detect that the valve cover originally had the flaw.
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Old 03-16-2019, 01:12 PM
  #30  
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Originally Posted by GearheadJoe View Post
My understanding about the flaw/no-flaw issue and the reproduction situation is this:

* GM had only one mold for the later-style aluminum valve cover
* In mid-1966, that mold developed a crack that created a flaw line through the "O"
* Paragon purchased the GM mold and uses it to make all of their reproduction valve covers of the late style
* To create a no-flaw valve cover, Paragon carefully machines the flaw line away

I've seen examples of the re-worked covers and they look pretty good, at least to a casual observer. I suppose that in NCRS judging, the judges look very closely and can probably detect that the valve cover originally had the flaw.
Too late for me to change the listing... someone bought them..
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