Casting flaw?
Thread Starter
Burning Brakes
Joined: Sep 2002
Posts: 1,003
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From: Scottsdale Arizona
Casting flaw?
Ok JohnZ or others - I have a early build (Dec 65) 66 350hp that has of course the alumium valve covers - it DOES NOT have the casting flaw in the O as others have. Various midyear books that I have are split on this subject as one book states "casting flaw is an aftermarket item" and others state that OEM covers have the casting flaw. Which one is correct??????
Also, I have seen many small block hoods have the support rod on the right and others on the left. I was told that if on the left (driver's side) was a big block, right small block. Holes in hood for both sides - which is correct???
Thanks in advance for clearing this up. Geez, you would think I would have better things to do than worry about this!
Also, I have seen many small block hoods have the support rod on the right and others on the left. I was told that if on the left (driver's side) was a big block, right small block. Holes in hood for both sides - which is correct???
Thanks in advance for clearing this up. Geez, you would think I would have better things to do than worry about this!
Team Owner
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From: Sitting in his Nowhere land Hanover Pa
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sometime in the early 67 run someone droped the mold for the cover and it cracked. and from there on the drivers side valve cover had the "flaw." or so I was told many times at Carilse. to answer your question from 66 on back the valve covers should have no flaw. about the hood support a small block support was on the right. big blocks on the left(drivers side). if you see a big block on the right that is a big clue that it is not a real big block
Drifting
Joined: Nov 2003
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From: Towanda KS
The NCRS Judging Guide states that the flaw line thru the letter "O" appeared approximately at the end of March 1966 with VIN 17000.
ALL aluminum "493" valve covers produced since that time have this flaw. Even the aftermarket parts sold by Paragon as they now own this mold.
There is no difference between the driver side and passenger side cover. They are identical.
ALL aluminum "493" valve covers produced since that time have this flaw. Even the aftermarket parts sold by Paragon as they now own this mold.
There is no difference between the driver side and passenger side cover. They are identical.
Drifting
Joined: Oct 2003
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[QUOTE=project63]ALL aluminum "493" valve covers produced since that time have this flaw. Even the aftermarket parts sold by Paragon as they now own this mold.
QUOTE]
You'd think they'd be able to repair the mold?
QUOTE]
You'd think they'd be able to repair the mold?
Team Owner
Joined: Oct 2000
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From: Washington Michigan
It's very expensive to repair a high-pressure die-cast mold, especially the female side that contains the detail; I'm sure the mold will remain with the flaw.
Page 338-339 of Noland's book explains the story on the left-vs.-right hood support mounting, which has been found to be inconsistent; non-A/C 327's had it on the passenger side, and it has been found on the left side on later 327 A/C cars due to interference with re-routed A/C and heater hoses on the right side.
Page 338-339 of Noland's book explains the story on the left-vs.-right hood support mounting, which has been found to be inconsistent; non-A/C 327's had it on the passenger side, and it has been found on the left side on later 327 A/C cars due to interference with re-routed A/C and heater hoses on the right side.
Team Owner
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From: eville in
Originally Posted by project63
The NCRS Judging Guide states that the flaw line thru the letter "O" appeared approximately at the end of March 1966 with VIN 17000.
ALL aluminum "493" valve covers produced since that time have this flaw. Even the aftermarket parts sold by Paragon as they now own this mold.
There is no difference between the driver side and passenger side cover. They are identical.
ALL aluminum "493" valve covers produced since that time have this flaw. Even the aftermarket parts sold by Paragon as they now own this mold.
There is no difference between the driver side and passenger side cover. They are identical.
