67 L79 intake bolts are black phosphate, right?

[Chris E.]

Am I remembering that the intake bolts for a 67 L79 are black phosphate?

[Bill I.]

Re: 67 L79 intake bolts are black phosphate, right?

Chris, mine are the same color as the manifold. Bill.

[Larry M.]

Re: 67 L79 intake bolts are black phosphate, right?

Chris, mine are the same color as the manifold. Bill.

Same for my 1967 327/350 HP car.

Larry

[Bill I.]

Re: 67 L79 intake bolts are black phosphate, right?

Chris, I stand corrected somewhat. The bolts are indeed black phosphate, then painted intake color. Bill.

[Chris E.]

Re: 67 L79 intake bolts are black phosphate, right?

Ok, so someone help me better understand how that was done then. This is probably in the archives somewhere, but my searching ability lately kind of sucks.

How did they paint the intake aluminum color, that must have been AFTER it was installed, since the bolts got hit with aluminum paint eh?



What happens if I leave my bolts zinc plated? Is there a big deduct for that?

[William C.]

Re: 67 L79 intake bolts are black phosphate, right?

For the aluminium intake engines there was a secondary process that silver painted the area between the intake and the valve cover, with coverage typically included most if not all of the bolt heads.

[Patrick T.]

Re: 67 L79 intake bolts are black phosphate, right?

The latest edition of the '67 Judging Manual states: L79 350hp...."Known original cars use black phosphate hex head bolts without integral washers. The bolts MAY be painted silver during the intake painting process."

My bolts are black and that complies with the above, so I don't see where I should get any point deduct during judging. PT

[Chris E.]

Re: 67 L79 intake bolts are black phosphate, right?

Well, I guess this is kind of a non-issue for me anyway. I'm going to get dinged for using washers on the intake bolts anyway, so what finish they are, probably isn't a big deal.

[Patrick H.]

Re: 67 L79 intake bolts are black phosphate, right?

Well, I guess this is kind of a non-issue for me anyway. I'm going to get dinged for using washers on the intake bolts anyway, so what finish they are, probably isn't a big deal.

Well, actually you get double-dinged then. Once for washers, once for finish.

FYI, some use "AN" style washers as they're small enough to often hide under the bolt head yet still protect the aluminum.

http://www.speedwaymotors.com/Stainless-Steel-AN-Washers-Pack-of-50,4817.html

Patrick

[Chuck S.]

Re: 67 L79 intake bolts are black phosphate, right?

The latest edition of the '67 Judging Manual states: L79 350hp...."Known original cars use black phosphate hex head bolts without integral washers. The bolts MAY be painted silver during the intake painting process."

My bolts are black and that complies with the above, so I don't see where I should get any point deduct during judging. PT

Those responsible for the 67 JM should take a reeel close look at 67 manifold bolts using Terry McManmon's description of how to determine a phosphate finish. I can't recall ever seeing a black phosphate strength fastener (head bolts, manifold bolts, etc) on an engine...the hard, slick, black finished engine fasteners I've observed were undoubtably black oxide.

[Michael H.]

Re: 67 L79 intake bolts are black phosphate, right?

Well, actually you get double-dinged then. Once for washers, once for finish.

FYI, some use "AN" style washers as they're small enough to often hide under the bolt head yet still protect the aluminum.

http://www.speedwaymotors.com/Stainless-Steel-AN-Washers-Pack-of-50,4817.html

Patrick

See all the trouble I've started with my "dull aluminum paint" on the intake gasket surface of cyl heads theory.

[John H.]

Re: 67 L79 intake bolts are black phosphate, right?

I can't recall ever seeing a black phosphate strength fastener (head bolts, manifold bolts, etc) on an engine...the hard, slick, black finished engine fasteners I've observed were undoubtably black oxide.

Chuck -

Black oxide was a very costly premium finish for a fastener in the 60's; the only place I recall seeing it on a midyear is on the five exposed cluster screws.

[Scott S.]

Re: 67 L79 intake bolts are black phosphate, right?

Chuck -

Black oxide was a very costly premium finish for a fastener in the 60's; the only place I recall seeing it on a midyear is on the five exposed cluster screws.

Hi John,

I have read here on the TDB that the exposed heads of the original instrument cluster screws are brownish in color, and that's what mine were. Is that just the result of aging?

If so, is there a way to duplicate that "browning" effect, besides waiting 43 years?

[Gerard F.]

Re: 67 L79 intake bolts are black phosphate, right?

Hi John,

I have read here on the TDB that the exposed heads of the original instrument cluster screws are brownish in color, and that's what mine were. Is that just the result of aging?

If so, is there a way to duplicate that "browning" effect, besides waiting 43 years?

Scott,

Actually a mixture of zinc phosphate and black oxide will produce a browning effect. But the original was probably just black.

Take a look at this post:

https://www.forums.ncrs.org/showthre...phate&uid=7017

Within it is a Restorer Article on gray and black phosphate

[Gerard F.]

Re: 67 L79 intake bolts are black phosphate, right?

Forgot to mention Scott, the cluster screws on my 67 are also somewhat brown.