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[C1] Casting flaw in aluminum valve covers

 
Old 03-11-2019, 11:32 AM
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62cruiseer
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Default Casting flaw in aluminum valve covers

Okay, I've been told the aluminum valve covers for the higher HP 327's had a casting flaw that went through the "O", but only on 1966 and later engines. But, parts houses act like the flaw is correct for the 62's with 340 or 360 HP. Which is correct for 62....flaw or no flaw?

Butch
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Old 03-11-2019, 11:34 AM
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Parts houses want to sell you parts.

You are correct...you need a "no flaw" cover for your 62 340 or 360 HP car.
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Old 03-11-2019, 12:04 PM
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And apparently there was only one mold for ALL the valve covers. So every one cast after 66 has the flaw. Even the ones today as they are using the same tooling
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Old 03-11-2019, 12:12 PM
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Originally Posted by 62cruiseer View Post
Okay, I've been told the aluminum valve covers for the higher HP 327's had a casting flaw that went through the "O", but only on 1966 and later engines. But, parts houses act like the flaw is correct for the 62's with 340 or 360 HP. Which is correct for 62....flaw or no flaw?

Butch
They'll also sell you rubber gaskets to go under the exterior door locks and "paint protectors" for the bumpers...
Not original...
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Old 03-11-2019, 01:06 PM
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OK, agree on vendors, but did the original 62 327/340 engines come with flawed or none flawed valve covers?


Butch
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Old 03-11-2019, 01:07 PM
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NON-flawed... The mold cracked in mid-66 and subsequent covers have the crack - its that simple..
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Old 03-11-2019, 01:19 PM
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Originally Posted by 62cruiseer View Post
OK, agree on vendors, but did the original 62 327/340 engines come with flawed or none flawed valve covers?


Butch
NO flaw, and it's highly unlikely that you'll find NOS ones.

Look for these currently on EBAY. No comment about the price.

You want original mid 59--67 NON staggered holes, NO casting flaw.

https://www.ebay.com/itm/Late-1959-1...UAAOSwPfBb17HT
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Old 03-11-2019, 01:29 PM
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Originally Posted by Chuck Gongloff View Post
NO flaw, and it's highly unlikely that you'll find NOS ones.

Look for these currently on EBAY. No comment about the price.

You want original mid 59--67 NON staggered holes, NO casting flaw.

https://www.ebay.com/itm/Late-1959-1...UAAOSwPfBb17HT
And to add to Chuck's relevant remarks....be wary of what's been done to used ones if you are an originality zealot. Many have been chromed, polished, bead blasted, painted, abused and patched. Once they have been tinkered with to a certain extent they will never approach the original look of the raw aluminum...
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Old 03-11-2019, 01:35 PM
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Thanks Chuck,

I don't need numbers matching and some of the vendors sell flaw corrected covers. The ones installed on this car at restoration were bought at Carlisle and apparently the restorer didn't know the difference. MIght change them out and might not, certainly not a priority, just wanted to know what was right.

Butch
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Old 03-11-2019, 01:42 PM
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Originally Posted by 62cruiseer View Post
Thanks Chuck,

I don't need numbers matching and some of the vendors sell flaw corrected covers. The ones installed on this car at restoration were bought at Carlisle and apparently the restorer didn't know the difference. MIght change them out and might not, certainly not a priority, just wanted to know what was right.

Butch

The flaw corrected covers Iíve seen leave a bit to be desired.

Treat yourself. Buy the best and only cry once. 😀
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Old 03-11-2019, 02:05 PM
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OK, LET'S TRY TO CLEAR THIS UP ONCE AND FOR ALL!!!!!!!!!!!!! THIS QUESTION COMES UP ALL THE TIME.
FINNED VALVE COVERS WITH THE LINE THROUGH THE o, BEGAN SHOWING UP DURING MID 1966 PRODUCTION.
NOTHING, ZERO, ZIP, NADA-------------PRODUCTION OR SERVICE REPLACEMENT PARTS, FROM THE CHEVY PARTS DEPT, DID NOT, DID NOT, DID NOT HAVE THE FLAW PRIOR TO MID 1966 PRODUCTION! NO IF's, AND's, BUT's OR MAYBE's!
THUS, ANY, ANY, ANY, ANY 60 THROUGH EARLY PRODUCTION 66 CORVETTE SHOULD NOT HAVE FLAWED VALVE COVERS-----------NO MATTER WHAT ENGINE OPTION THE CAR HAS!!!!!!!!!!!!!!
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Old 03-11-2019, 02:10 PM
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Originally Posted by Chuck Gongloff View Post
The flaw corrected covers Iíve seen leave a bit to be desired.

Treat yourself. Buy the best and only cry once. 😀
The valve covers, which some vendors sell, and have SUPPOSEDLY eliminated the flaw-------------------the flaw can easily be seen when examined closely. I have NEVER seen a valve cover with the flaw removed, that cannot still be detected. The flaw goes down into the metal to such an extent that it can still be seen.
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Old 03-11-2019, 02:30 PM
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Great information guys! I now know what I'm supposed to have and what to look for. I'll never be judge (well, my car won't) so I have time to think about this. It's the education I was wanting, which also lets me know about the honesty of the vendors who are selling them as correct for engines prior to 1966. I know they can't know every......but.



BH
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Old 03-11-2019, 05:11 PM
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Another thing is the crack and O in Corvette got very ugly looking over the years as they continued to use the original mold. Some owners use a dremel to get some of the aluminum flash out.
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Old 03-11-2019, 07:21 PM
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Originally Posted by DZAUTO View Post
OK, LET'S TRY TO CLEAR THIS UP ONCE AND FOR ALL!!!!!!!!!!!!! THIS QUESTION COMES UP ALL THE TIME.
FINNED VALVE COVERS WITH THE LINE THROUGH THE o, BEGAN SHOWING UP DURING MID 1966 PRODUCTION.
NOTHING, ZERO, ZIP, NADA-------------PRODUCTION OR SERVICE REPLACEMENT PARTS, FROM THE CHEVY PARTS DEPT, DID NOT, DID NOT, DID NOT HAVE THE FLAW PRIOR TO MID 1966 PRODUCTION! NO IF's, AND's, BUT's OR MAYBE's!
THUS, ANY, ANY, ANY, ANY 60 THROUGH EARLY PRODUCTION 66 CORVETTE SHOULD NOT HAVE FLAWED VALVE COVERS-----------NO MATTER WHAT ENGINE OPTION THE CAR HAS!!!!!!!!!!!!!!
What constitutes "... EARLY PRODUCTION 66 ..."? S/N cut-off?

Thank you
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Old 03-11-2019, 08:03 PM
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Of purely academic interest....do we know what company now owns the mold and makes the valve covers these days?
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Old 03-11-2019, 08:06 PM
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Originally Posted by SI67 View Post
Of purely academic interest....do we know what company now owns the mold and makes the valve covers these days?
Paragon Reproductions
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Old 03-11-2019, 08:13 PM
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Originally Posted by leif.anderson93 View Post
Paragon Reproductions
I think they also have the molds for the C2 bumpers.
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Old 03-11-2019, 08:21 PM
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Originally Posted by Frankie the Fink View Post
I think they also have the molds for the C2 bumpers.
correct. plus more tooling from original GM suppliers
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Old 03-12-2019, 10:00 PM
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You need these...they are available..$425 shipped in the USA

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