'55 1500 N Valve cover finish advice needed

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Daryl Bertram
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'55 1500 N Valve cover finish advice needed

#1 Post by Daryl Bertram » Tue Apr 30, 2019 1:20 am

I have a '55 1500 N engine and want to refurbish the valve covers as it came from the factory. Is this an anodized finish? Thanks for your advice. :-)
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Joris Koning
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Re: '55 1500 N Valve cover finish advice needed

#2 Post by Joris Koning » Tue Apr 30, 2019 6:45 am

Silver zinc I believe
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Daryl Bertram
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Re: '55 1500 N Valve cover finish advice needed

#3 Post by Daryl Bertram » Tue Apr 30, 2019 4:55 pm

Thank you Joris. Added to my to-do list. :-)

Ivan Fuller
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Re: '55 1500 N Valve cover finish advice needed

#4 Post by Ivan Fuller » Wed May 01, 2019 12:14 pm

zinc in '55?
Cad surely? - Almost impossible to get done these days
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Alfred Knittel
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Re: '55 1500 N Valve cover finish advice needed

#5 Post by Alfred Knittel » Wed May 01, 2019 12:22 pm

I had mine power coated. Silver.
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Doug McDonnell
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Re: '55 1500 N Valve cover finish advice needed

#6 Post by Doug McDonnell » Wed May 01, 2019 12:39 pm

Clear Zinc.Although some swear Cad 1 plated. I wish Brad would answer this one. Or someone took a known original that was never refinished and had it tested to determine Clear zinc or Cad1
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Brad Ripley
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Re: '55 1500 N Valve cover finish advice needed

#7 Post by Brad Ripley » Wed May 01, 2019 4:53 pm

Clear zinc -- thoroughly bead blast first.

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Doug McDonnell
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Re: '55 1500 N Valve cover finish advice needed

#8 Post by Doug McDonnell » Wed May 01, 2019 6:06 pm

Thank you Brad. I looked in my B and C parts books but never found a finish.
Last edited by Doug McDonnell on Wed May 01, 2019 6:48 pm, edited 1 time in total.
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Vic Skirmants
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Re: '55 1500 N Valve cover finish advice needed

#9 Post by Vic Skirmants » Wed May 01, 2019 6:40 pm

all fixed
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Doug McDonnell
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Re: '55 1500 N Valve cover finish advice needed

#10 Post by Doug McDonnell » Wed May 01, 2019 6:48 pm

Apple autofill that I missed Vic. Thanks for being kind.
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Daryl Bertram
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Re: '55 1500 N Valve cover finish advice needed

#11 Post by Daryl Bertram » Wed May 01, 2019 9:18 pm

Thank you Brad and everyone with advice here. Much appreciated!

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Wil Mittelbach
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Re: '55 1500 N Valve cover finish advice needed

#12 Post by Wil Mittelbach » Thu May 02, 2019 12:38 am

Cad; per photo of my cad re-plated valve cover duplicating it's original finish.
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Joris Koning
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Re: '55 1500 N Valve cover finish advice needed

#13 Post by Joris Koning » Thu May 02, 2019 2:29 am

Okay, I refer to clear zinc as silver zinc. With regard to testing these, I have all of Tim Goodrich's old notebooks on his restorations. He did this for some cars (not a 55) and they came out as zinc. With regard to cad. It is a popular misconception that people think (I used to be one of them) that many of the plating on our cars was originally cad, it is not. The other is that many of the undercarriage hardware is black oxide, again, it is not. I believe that factory used 2-3 different kinds of phosphate finishes of which the dark black used on most of the undercarriage hardware has been a mystery to me.
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Wil Mittelbach
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Re: '55 1500 N Valve cover finish advice needed

#14 Post by Wil Mittelbach » Thu May 02, 2019 3:09 am

Rather than further debate original cad versus zinc plating, suggest you re-plate your valve covers with whatever your choice may be.

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Tom Wavrin
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'55 1500 N Valve cover finish advice needed

#15 Post by Tom Wavrin » Tue May 07, 2019 1:34 pm

Daryl & Joris, Tim Goodrich advised me to plate the valve covers with clear (silver) zinc on my 55100 coupe. He also had brightness/sheen measurements for black painted suspension parts and engine sheet metal taken from NOS parts. He documented all the fastener finishes (also with pictures) on the '56 "Keno coupe" that had 27K original miles on it when he disassembled it for Chris in preparation for its restoration. I believe I still have a compilation of notes for fastener finishes and types from a 1 owner, never disassembled '58 Speedster.
Wil, I like the look and built-in durability of your Cad finished, non-vented valve covers....
Tom, Reg # 10576, Oregon
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