they were painted silver while bolted onto the engine. The black bolts were also painted silver during this process. Does anyone have a picture of a manifold being painted at the factory with the box like cover that kept the paint just on the manifold only? Thanks for any pictures. PT
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Re: '67 Aluminum Intake manifold paint process...
I do not believe an aluminum intake was ever painted silver. They are natural cast aluminum. The bolts should be plated as well. The engine was then painted and orange overspray formed on the exhaust manifolds and the intake manifold / intake manifold bolts.
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Re: '67 Aluminum Intake manifold paint process...
Dave, I was just going by what the latest edition of the '67 Judging Manual says. I had my car judged a few months ago and left the black bolts black and the Judges hit me up for a couple points because they said...the bolts should be painted silver along with the manifold.
It does seem kind of silly to paint an aluminum silver colored manifold silver to begin with but when getting a car judged, the manual rules, so I have to keep em happy. PTComment
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Re: '67 Aluminum Intake manifold paint process...
Patrick, is it possible you misunderstood, maybe they said painted silver to MATCH the manifold. That does not mean the manifold was painted. BillComment
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Re: '67 Aluminum Intake manifold paint process...
Bill, I should have mentioned the engine is an L-79 350 HP, not the base 300 hp.
The Judging Manual states on page 77:
"The L-79 350 HP engine uses an aluminum intake painted silver. Known original cars use black phosphate hex-head bolts without integral washers. The bolts may be painted silver during the intake painting process."
Sounds pretty clear to me and the judges let me know it too!
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Re: '67 Aluminum Intake manifold paint process...
I agree, just read the same thing. I seem to recall, and may be wrong about this, but there was a discussion on the book being wrong, and will be corrected in next edition. Bill.Comment
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Re: '67 Aluminum Intake manifold paint process...
The "dull aluminum" paint process was performed at the Flint plant to cover the otherwise unpainted cast iron surface of the cylinder head between the intake manifold and valve cover. This surface was painted engine orange on engines with cast iron intake manifolds but naked on engines (small blocks) with aluminum intakes.
For engines with cast iron thermostat housings, the housing was another target.
During this process, dull aluminum paint overspray would partially cover the intake manifold and valve cover.
There are some good discussions on this topic in the archives.
I don't know if this process was used for 62 and earlier, or for 68 and later. I know it was used for C2 though.
I've never seen a picture of the actual dull aluminum paint process or the mask that was used to shield the other parts of the engine.Comment
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Re: '67 Aluminum Intake manifold paint process...
I have "issues" with that too at times.
I've posted several pic's of engines that show the remains of the dull alum paint over the years. Maybe that's what you remember seeing?
I also posted a closeup shot of a new 63 340 HP engine that shows the dull alum on the thermostat housung and bolts.Comment
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Re: '67 Aluminum Intake manifold paint process...
Well Michael, since you brought up C3s .... I wasn't going to mention it because that wasn't what Patrick asked about ..... BUT:
For 1970-1972 small block aluminum intake engines (LT1) The aluminum intakes were definitely painted dull silver; black bolts and engine lifting hook as well as most of the exposed inner head surface. HOWEVER ... that was not the question Patrick asked.
Now I promise to go out to the swap meet and stimulate the economy.TerryComment
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Re: '67 Aluminum Intake manifold paint process...
Now that we strayed a little from the 67 SB I'll throw in a little evidence of the silver paint. When I first heard of this silver just was not sure it was the real deal so looked at an old (but not used since 1972) intake adapter on a spare 63 FI unit and found the water goose neck did have silver on it.
What was really impressive, the front of the fuel blocks on my 64 FI unit still had silver paint on them (front ones).
And Terry isn't one of those intake bolts in 70 black - the one installed later to hold the coil!
With all the old photo's that Michael and others have you can bank on the silver paint as real- just may not want to apply in the messy manor GM did.Comment
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Re: '67 Aluminum Intake manifold paint process...
Here's a shot of a brand new 63 340 HP engine. The thermostat housing that would have been black, as installed, is now coated in dull aluminum. So are the studs and nuts.Last edited by Michael H.; January 30, 2010, 01:10 PM.Comment
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Re: '67 Aluminum Intake manifold paint process...
Ok, let me rephrase my original question. The first engine picture directly below is an '67 L-79 engine like mine, except this car has an NCRS Duntov Award. It's highly likely that the manifold paint scenario on this one is correct.
It appears that the area on top of the engine from the top of the valve covers, up the manifold, to the carb is all painted silver. The way mine is painted is that area between the top edge of the valve covers and the edge of the manifold is orange.
Also, when the manifold was painted were the attachments for the carb spring on the left and the bracket on the right in place when painted or were they put on after painting? My engine is on the bottom and is painted red between the manifold and the top of the valve cover. Sorry to be a noodge but I really want to get it right this time. Many thanks, PT
What do you L-79 guys have?
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Re: '67 Aluminum Intake manifold paint process...
Patrick, your engine is way wrong with the paint. Even your PLUGS are painted! Bill.Comment
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Re: '67 Aluminum Intake manifold paint process...
Ok, I got what I needed. This is the picture of what I was looking for. Thanks to everyone for their help! PT
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