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Stock Valve Cover Finish

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    So how can they ding you for a bead blasted finish? If the beads are fine enough, it would look very similar to that!

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    Timely post for me (and anyone else interested in a correct stock restoration) that you made here Philip-------and exactly as you said in your reply just now Charles!!

    How would you describe the finish as shown in the photos of this NOS valve cover??

    Raw aluminum, as from the mold, satin finish???

    Do you think there were any additional treatments or processes used to remove casting flash or surface/ finish irregularities?

    Attached is the judging sheet I received for entry of Zilver, my 1973 240Z, at the 2019 ZFest/Zcon held in Branson this past summer.

     

    1 Zup Daniels 240Z stock.pdf

     

    The most difficult point deduction for me to understand regarding the comment of the judges was regarding the finish of the valve cover.

    ENGINE and ENGINE COMPARTMENT                                                      Comments                                                                         Deduction

    2. Engine block / oil pan / cylinder head                                                    valve cover finish blasted                                                         1

    My query is this:   

    What is one to do?

     

    IMG_4107.JPG

    This photo is from engine restoration prior to Zcon 2015 in Memphis when I entered Zilver in "240Z Street Modified" class----before I made the conversion back to the original flat tops.

     

     

    After 47 years of accumulated use, (being subjected to oil changes, valve adjustments and all other manner of possible maintenance issues) certainly most, if not all, valve covers will need some form of restoration back to "as from factory" condition. Paint, polish or plating are obviously not correct finishes.

    At the time of my restorative efforts I chose to have the cover bead blasted with a very fine USED glass bead. It almost had the consistency of flour and the cover was gone over several times until there was an even surface appearance and texture. Satin finish---no gloss or swirl---it looked very much to me like the NOS example you linked above.

    I then applied GIBBS BRAND OIL to the cover liberally, several times, removing the excess after several minutes so there was no pooling or surface wetness.

    The GIBBS penetrates into the pores of the metal and (because it is there first) prevents the entry of anything in the way of water, other oils, dirt or combustion soot from adhering or accumulating and its anti-corrosion properties prevent oxidation of the aluminum (white spots or flaking). A simple rinse with Dawn detergent mixed with water over the surface followed by a thorough rinse from the garden hose with clean water, allow to dry, and a re-application of the GIBBS oil has maintained the cover for the last 5 years. Zilver is no "garage queen". The  car is frequently driven locally and has been driven from N.W. Arkansas to and back from each of the Zcons  attended. (Memphis, Austin, Atlanta and Branson)

    I don't know of any other way. In agreement with what Charles said above----What would the judges have us to do if not bead blast????

    This is not "sour grapes" or meant to be a slam on the judges but-----

    BE REASONABLE!!!

     

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    I have an NOS L4 valve cover that looks a lot like the ebay cover. The finish really appears like un-finished raw aluminum, and there is lots of variability in the finish. It is not shiny, but has some reflective qualities. It does look a lot like freshly fine bead blasted, but more variable and smoother if that makes any sense. This cover has been in open air for 40+ years on an NOS L18 SSS motor on display.

    I'll try to get some sun lit pictures that show the variations. 

    There has I believe been some continued oxidation with time while in my possession.

    IMG_2997.JPG

    IMG_2996.JPGIMG_2995.JPG

     

    Edited by zKars

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    Zup summed that up for me succinctly! Most valve covers will need some restoration. I wouldn't want to bolt a less than pristine valve cover onto one of Motormans cars or Zups or any number of other cars on this site. So how do judges expect that to happen? Maybe some one could tag Fred Buoni to weigh in on this? I would be surprised if the valve covers came out of the mold exactly as they appear NOS

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    My guess is they want one that looks like it did on the day it left the factory or shortly thereafter on dealer delivery. We may be going just a bit too far sometimes to make our details look a bit too fresh and consistent.

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    2 hours ago, Patcon said:

    ..... Maybe some one could tag Fred Buoni to weigh in on this? I would be surprised if the valve covers came out of the mold exactly as they appear NOST

    Tag for Fred @zpizzaman20

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    On 10/13/2019 at 8:06 AM, Zup said:

    Attached is the judging sheet I received for entry of Zilver, my 1973 240Z, at the 2019 ZFest/Zcon held in Branson this past summer.

     

    1 Zup Daniels 240Z stock.pdf 2.3 MB · 6 downloads

     

     

    Zup, we (Motorman7 with my '73) also got dinged a point for the bead blasted valve cover. 

    However, in looking at your judging sheets, my calculator says you achieved 290 points, which is the level ("290 or above")  for the Gold Medallion status.

    From the current ZCCA Judging Manual " All vehicles scoring a total overall score of two hundred and ninety (290) points or above in their respective class (except Daily Driver) are eligible to receive the Gold Medallion or Gold Cup achievement award of excellence for their efforts."
     

    I know they did not announce that for you at ZCON, but have you received that since?  I hope so, you deserve it!

    Edited by jayhawk
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    2 hours ago, jayhawk said:

     

    From the current ZCCA Judging Manual " All vehicles scoring a total overall score of two hundred and ninety (290) points or above in their respective class (except Daily Driver) are eligible to receive the Gold Medallion or Gold Cup achievement award of excellence for their efforts."
     

    I know they did not announce that for you at ZCON, but have you received that since?  I hope so, you deserve it!

    I wish he did, no one deserves it more.   The key word there is "eligible",  I believe it is up to the judges discretion in their final meeting whether or not to award the gold level award.  

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    3 hours ago, jayhawk said:

     

    Zup, we (Motorman7 with my '73) also got dinged a point for the bead blasted valve cover

    However, in looking at your judging sheets, my calculator says you achieved 290 points, which is the level ("290 or above")  for the Gold Medallion status.

    From the current ZCCA Judging Manual " All vehicles scoring a total overall score of two hundred and ninety (290) points or above in their respective class (except Daily Driver) are eligible to receive the Gold Medallion or Gold Cup achievement award of excellence for their efforts."
     

    I know they did not announce that for you at ZCON, but have you received that since?  I hope so, you deserve it!

    The judging sheets received by each entrant are typically from the first round of judging.  These results are used two ways: (1) they are used to determine all of the awards other than Gold Medallion or Gold Cup; (2) any car scoring 290 or more is then re-judged for Gold Medallion or Gold Cup.  The re-judging is substantially more intense and detailed, most cars will lose additional points and any car still managing to hold on to 290 or more will be awarded Gold.  To the best of my knowledge, the judging sheets from the second round are never released.

    In 2015 at Memphis, I scored 298 in Street Modified first round, losing one point on the engine and one on the interior.  The second round almost killed me with a loss of an additional eight points, dropping me to 290.  The judging sheets I received covered only the first round, I was never told what the additional second round deductions were for.

    I see this practice as intentional and probably well-meaning.  If an entrant is told about every deduction on the second round, then every entrant has a strong likelihood of being awarded Gold at the next convention (if they drop below 290 at the current event).

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    While this is evolving toward the zietgiest of trophy shows, I would digress to the original question; "why me?"

    I would guess that the judges saw what was evident even in the low res foto, i.e. the surface texture (not the color). Remember, the covers are cast into a finished metal mold, so the surface of the cast piece should be as tight and smooth as the mold.

    One could presumably re-create an out-of-the-mold surface after abrasion by sanding, burnishing, etc., but then there is the issue of color.

    Of course, it is presumption on my part, but I should think the only way to avoid this "overprep" pitfall, would be to refrain from any abrasion treatment in the first place. I should think a more productive approach would be a chemical treatment that would homogenize the color without effecting the surface.

    Just $.02 from the "I never show" gallery.

     

     

     

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    Well I bought the thing for $315. Could not resist and not sure if a good deal. Now, do I keep the stickers on when I install or take them off?

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    3 minutes ago, 240260280 said:

    Do us all a big favour and loan it to Zup for 2020 ZCON!

    I could probably do that. My car is getting paint, engine rebuild and will not need till next fall.

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    YOUSE GUYS ARE KILLIN ME WITH KINDNESS HERE!

    Thanks for the thought Philip,and the possible offer, Mr. Frankenstein. (is that steen ? or stine ?---:unsure:)

    I doubt that a single point deduction of the valve cover finish will make or break my chances at Nashville. Each year it is usually my own fault due to some neglected bits of dirt or overlooked insect carcasses that cumulatively do the damage and throw the spanner in the works.

    It's OK. I'll keep trying.

     

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    1 hour ago, Zup said:

    YOUSE GUYS ARE KILLIN ME WITH KINDNESS HERE!

    Thanks for the thought Philip,and the possible offer, Mr. Frankenstein. (is that steen ? or stine ?---:unsure:)

    I doubt that a single point deduction of the valve cover finish will make or break my chances at Nashville. Each year it is usually my own fault due to some neglected bits of dirt or overlooked insect carcasses that cumulatively do the damage and throw the spanner in the works.

    It's OK. I'll keep trying.

     

    Frankie for short! I figure my 260 is made up of parts from 240 and 280. Offer always stands. I would like to make it to Nashville Z since it is where I lived most of my life.

    Jim

    Edited by Frankenstein
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