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Author Topic: 1968 disc brake proportioning valve big nut  (Read 6319 times)

john302

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1968 disc brake proportioning valve big nut
« on: December 06, 2009, 02:26:21 AM »
What is the correct plating on the proportioning valve big nut ?It is for my Dec.67 built 68z. I always thought silver zinc was correct,but the one I just took apart is gray phosphate. Has anyone else seen this before?  Thanks John
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JohnZ

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Re: 1968 disc brake proportioning valve big nut
« Reply #1 on: December 06, 2009, 04:38:46 PM »
Photo below is my '69 - the master cylinder and booster have been restored, but the metering valve is original and has never been touched.
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'69 Z/28
Fathom Green
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sd1968z28

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Re: 1968 disc brake proportioning valve big nut
« Reply #2 on: December 07, 2009, 06:54:05 PM »
i think my 68z built  in april it was  plain cast color.
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Jerry@CHP

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Re: 1968 disc brake proportioning valve big nut
« Reply #3 on: December 07, 2009, 09:41:11 PM »
67 and 68 nuts were not plated silver cad like the '69s.  The '69 nuts are also larger in dia.

Jerry
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john302

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Re: 1968 disc brake proportioning valve big nut
« Reply #4 on: December 10, 2009, 05:29:41 AM »
Is gray phosphate the correct plating?
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68Zproject

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Re: 1968 disc brake proportioning valve big nut
« Reply #5 on: December 10, 2009, 11:08:55 PM »
Mine was just bare metal, but who knows what it looked like when it left the factory.
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68Z28

Pex68

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Re: 1968 disc brake proportioning valve big nut
« Reply #6 on: December 20, 2009, 10:27:10 PM »
Here's some pic's of a NOS one.  The plating is more of a tin-zinc that's not been buffed or tumbled.
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Chris P
1968 Sequoia Green SS 396/325 M20

Jerry@CHP

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Re: 1968 disc brake proportioning valve big nut
« Reply #7 on: December 21, 2009, 03:53:20 AM »
They were not plated in '67 and '68.

Jerry
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