Author Topic: GM 3877660 Water Outlet  (Read 2947 times)

cook_dw

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GM 3877660 Water Outlet
« on: June 22, 2013, 06:42:50 PM »
Does anyone know when the cut off was for the number being cast into the neck portion and the base?  Or was this a result of different manufacturers?
Darrell Cook
1967 LeMans Blue SS/RS L35 clone
1968 Rallye Green SS L78 - unrestored original
1968 Matador Red Z28

69Z28

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Re: GM 3877660 Water Outlet
« Reply #1 on: June 23, 2013, 02:39:21 AM »
That's a damnnn good question. I have one of both. I wonder if it's like the coil bracket for the cowl induction set up. I have one with the notch and one without.
GaryC

'UNRESTORED' 1969 Cortez Silver X33D80 Z28

sixt9x33rs

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Re: GM 3877660 Water Outlet
« Reply #2 on: June 23, 2013, 02:40:40 AM »
My understanding is that the part with the casting number in the neck is a service replacement. The one on the flange is the production line part. I have read this somewhere but what I read could had been incorrect. Maybe someone else will chime in.
'69 RS Z/28 Olympic Gold, 711
Flat hood no spoiler, black top, endura, 4:10
POP 39,000
69 X77 Z/28 69 711 Original Paint Unrestored
'69 X66 Convertible Cortez Silver 712 black top Endura, auto, bumper guards, am/fm rear speaker 44k miles

cook_dw

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Re: GM 3877660 Water Outlet
« Reply #3 on: June 23, 2013, 03:24:36 AM »
My understanding is that the part with the casting number in the neck is a service replacement. The one on the flange is the production line part. I have read this somewhere but what I read could had been incorrect. Maybe someone else will chime in.

Here are some pics I have found for comparison.  Notice that the location of the casting # is in a slightly different location and the service replacement looks too crisp compared to the others..


Casting on the base on top and service replacement bottom.

 

Guessing that this is another service replacement.  Also notice the little bump in the casting of the neck portion versus the orange painted one below



Guessing that is one is a production outlet. No casting bump on neck above #.



I could be completely wrong on this but I am hoping others will chime in with what is on their original cars..
Darrell Cook
1967 LeMans Blue SS/RS L35 clone
1968 Rallye Green SS L78 - unrestored original
1968 Matador Red Z28

cook_dw

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Re: GM 3877660 Water Outlet
« Reply #4 on: June 23, 2013, 03:29:02 AM »
Another comparison here is the outlet off my fathers car.  Notice that the #'s are not perfectly in line like the service replacements.  Too hard to tell on the orange one in previous post.

Darrell Cook
1967 LeMans Blue SS/RS L35 clone
1968 Rallye Green SS L78 - unrestored original
1968 Matador Red Z28

Mike S

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Re: GM 3877660 Water Outlet
« Reply #5 on: June 23, 2013, 03:38:23 AM »
My understanding is that the part with the casting number in the neck is a service replacement. The one on the flange is the production line part. I have read this somewhere but what I read could had been incorrect. Maybe someone else will chime in.

    I believe you are correct. I checked both my 67 396's (Feb and March 67 assembly) and they are on the flange with a diamond and the letter 'P' in it. I *think* I remember reading the the number changed to the neck in '69.

Mike
67 LOS SS/RS L35 Hardtop - Original w/UOIT
67 NOR SS/RS L35 Convertible - Restored

z28z11

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Re: GM 3877660 Water Outlet
« Reply #6 on: June 23, 2013, 04:56:32 PM »
As with any GM product, there were probably more than one supplier even on small parts like water necks. Note the two flange marked castings attached - two different fonts, two directions to the numbers (one in, one out). I have heard before that the Corvette restorers prefer one over the other - which is which ? Got to have date implications -

Regards,
Steve
1968 Z28 M21/U17 BRG/W
1969 Z28 X77/M20/VE3 LeMans/W
1969 L78 X66/N66 Cortez/BVT
1969 Z11 L48/M35/C60/C06

sixt9x33rs

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Re: GM 3877660 Water Outlet
« Reply #7 on: June 23, 2013, 07:04:48 PM »
My 69 X66 convertible has the "660" on the thermostat neck which I thought was a service replacement. My Z28 has the 660 on the flange but I put I installed that, and my L36 Vette has the 660 on the flange which I installed also. You may be right...different suppliers different casting locations. JohnZ probably knows.
'69 RS Z/28 Olympic Gold, 711
Flat hood no spoiler, black top, endura, 4:10
POP 39,000
69 X77 Z/28 69 711 Original Paint Unrestored
'69 X66 Convertible Cortez Silver 712 black top Endura, auto, bumper guards, am/fm rear speaker 44k miles

Edgemontvillage

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Re: GM 3877660 Water Outlet
« Reply #8 on: June 23, 2013, 07:18:44 PM »
Here is a post from John in 2005 on the subject:

JohnZ Jul 13th, 05
"This is a great debate subject. I have the GM drawing for 3877660, released in 1965, and it says "Cast manufacturer's identification, part number and General Motors trade mark location optional." Three different suppliers made this part over the years it was in use, and each one put the part number in a different place. In NCRS Corvette judging, the pattern that emerged after observing thousands of known-original cars indicates that those used through 1969 had the number on the flange, and those used from late 1969-up had it on the top of the outlet neck. The current reproduction, made by Paragon, has it on the outlet neck. My original 02D '69 Z/28 has it on the flange."
Lloyd
1969 RS Z/28 (Brooklyn Project)

z28z11

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Re: GM 3877660 Water Outlet
« Reply #9 on: June 23, 2013, 10:21:37 PM »
As with any GM product, there were probably more than one supplier even on small parts like water necks. Note the two flange marked castings attached - two different fonts, two directions to the numbers (one in, one out). I have heard before that the Corvette restorers prefer one over the other - which is which ? Got to have date implications -

Regards,
Steve

I forgot to add that my 01C X77 has it on the neck - same outlet since I bought the car in '73. Can't say yes or no if it was replaced before '73, but I worked on the car in '72 - same everything when I bought it a year later.
1968 Z28 M21/U17 BRG/W
1969 Z28 X77/M20/VE3 LeMans/W
1969 L78 X66/N66 Cortez/BVT
1969 Z11 L48/M35/C60/C06