66 L72 Valve Cover Cap

[Joe L.]

Re: 66 L72 Valve Cover Cap

get the original print for any part to know exactly how the supplier made it

Ronald-----

Get the original print to know how the supplier made it. Exactly! I posted above a link to an excerpt from the original print. What does it say about finish?

[Joe L.]

Re: 66 L72 Valve Cover Cap

Just to add to the mystery...
This zoomed in and rotated GM image (dated November 1965), can be seen in itz entirety via Noland's book.
You can see the 'early' square font style of the 'S' on the rivet, as well as the faint circular 'SMC' logo.
I'll let our members decide if they feel the oil cap is painted or plated... perhaps a tough decision.
And remember, since the 'S' changed over time, so too could have been the black 'coloring'.

[ATTACH=CONFIG]119977[/ATTACH]

Jack------


Notice the tiny "chip" and "scuffs" in the black finish. In my opinion, this is unlikely to occur with a black oxide finish but very likely to occur in this form with a painted finish. Also, if painted the paint was not applied thickly.

[Ronald L.]

Re: 66 L72 Valve Cover Cap

Guys
I also have over 8000 published photos, we are dealing with older pictures

those are die marks where the metal was squeezed pinched and reflect light

i have this on fresh black oxide part in exactly the same place on the stamping, in a raw bead blasted part, and an original un restored part

Joe

show me the Mark IV engine print where that painted can was released by Chevrolet Engineering

Nolans book has lots of great info
but not all of it is 100% accurate

if you go back 15 years, there was discussion about these caps not being painted

[Ronald L.]

Re: 66 L72 Valve Cover Cap

IMG_8039.jpgHere are three caps - all off the same stamping die by the way because at 60 parts a minute, the operation can produce sufficient caps for every BB produced.

You can note the "piching" in the die is in the same place and the logo is ins the same place because it was all in the same operation.

The left part is 66 original, the middle cap has been bead plasted which changes the surface texture and is very detectable to the trained eye, the Right part has been black oxide coated, and those details are left to a separate discussion.

If it can't be seen in the picture as posted here, it is very noticable to the eye the greenish hue.

These are the originals.

Now the Tonawanda expert can put the print, unless that is reserved for his book...

[Joe L.]

Re: 66 L72 Valve Cover Cap

Guys
I also have over 8000 published photos, we are dealing with older pictures

those are die marks where the metal was squeezed pinched and reflect light

i have this on fresh black oxide part in exactly the same place on the stamping, in a raw bead blasted part, and an original un restored part

Joe

show me the Mark IV engine print where that painted can was released by Chevrolet Engineering

Nolans book has lots of great info
but not all of it is 100% accurate

if you go back 15 years, there was discussion about these caps not being painted

Ronald-----

The specifications for the cap would not be shown on a "Mark IV engine print". The specifications for component parts of engine assemblies are shown on the drawings and specifications for the individual parts and, beyond part numbers for the components, are NOT SHOWN on "engine prints". I have some Tonawanda engine assembly drawings (although none for 1965 L-78) and NONE show specifications or drawings for individual component parts.

You said in a previous post "get the original prints to know how a supplier made it". I totally agreed. I posted an excerpt showing finish specifications from what is obviously an original GM print for the 3856959 cap. I asked you before----what does it say about finish? Could some of these caps been black oxide-finished? I suppose so but, if so, they were not finished to GM specifications and I've never seen an original example I believed to be black oxide finished. Since the GM #3856959 cap was never available in SERVICE, an NOS example is, be definition, non-existent.

Based on your later statement "Nolans book has a lot of great info but not all of it is 100% accurate" are you implying that Noland Adams somehow forged or altered the excerpt of the GM drawing?

[Ronald L.]

Re: 66 L72 Valve Cover Cap

Joe

errors in the information in the book in general

does not imply the offensive post you made

Im done