1966 L79 crank pulley finish: black phosphate coated with Parkolac 30

[Gary B.]

According to the '66 TIM&JG the crank pulley for L79 engines should be "black phosphate and coated with Parkolac 30 or equivalent".

Does anyone know of someone who can do black phosphate and then the equivalent of a Parkolac 30 treatment? My preference would be to send it to someone who can do the work for me.


Thanks,


Gary

[Michael M.]

Re: 1966 L79 crank pulley finish: black phosphate coated with Parkolac 30

Gary, I have done extensive research on this subject. The product that GM used or the company that did the Parkolac 30 is no longer available in it's original formula. Gunsmith's can do it to gun barrels and other parts of the gun, but it really does not look the same as the parts that had Parkolac 30 on them in the 1960's. If you have ever seen a pulley that had the original Parkolac 30 on them the finish is not that hard to reproduce.

[Gary B.]

Re: 1966 L79 crank pulley finish: black phosphate coated with Parkolac 30

Michael,

If it's reproducible, I'm surprised no one has created a hobby business for us NCRS types to rely on.

Gary

[Brian K.]

Re: 1966 L79 crank pulley finish: black phosphate coated with Parkolac 30

Gary I just had my 66 L79 crank and water pump pulley done in Black Phosphate by Detail Plating (Steve Gregori). He runs an ad in the Driveline just google him. They look nice but I was worried about rust issues so I put a coat of flat clear over top which didn't change the way they looked. I have no idea how the Parkolac 30 would change the black phosphate.

MVC-001S.JPG

MVC-002S.JPG

MVC-003S.JPG

[Gary B.]

Re: 1966 L79 crank pulley finish: black phosphate coated with Parkolac 30

Brian,

Thanks for the info. I'll contact Steve.

Gary

[Gene M.]

Re: 1966 L79 crank pulley finish: black phosphate coated with Parkolac 30

A very light spray of ultra flat black paint will give an excellent representation of black phosphate. Also platers can black oxide coat it to give the same appearance.

Keep in mind black phosphate or black oxide are not sacrificial finishes as zinc is and have very limited corrosion resistance.

[Gary B.]

Re: 1966 L79 crank pulley finish: black phosphate coated with Parkolac 30

Gene,

I agree about the flat black paint. I've done that on a a few parts that were meant to be black phosphate. But it's not the blackish finish that I'm mostly interested in. My main question that still remains unanswered is how does Parkolac 30 change the appearance of a black phosphate treated or flat black painted part?

Gary

[Gene M.]

Re: 1966 L79 crank pulley finish: black phosphate coated with Parkolac 30

Gene,

I agree about the flat black paint. I've done that on a a few parts that were meant to be black phosphate. But it's not the blackish finish that I'm mostly interested in. My main question that still remains unanswered is how does Parkolac 30 change the appearance of a black phosphate treated or flat black painted part? Gary

Gary,
I don't have any knowledge of the Parkolac 30. But I do with nos pulleys. The pulleys were of a phosphate finish that is between black and charcoal. The finish was not perfectly smooth, it has a slight texture to it but nothing like the pictures in post #4. I've never seen anything that textured on a pulley.

[Gary B.]

Re: 1966 L79 crank pulley finish: black phosphate coated with Parkolac 30

Gene,

I wonder if what looks like texture in the photos in post 4 is an artifact of the photos. Why would black phosphate with a flat clear coat on top wind up with a substantial texture?

Brian, is the surface as textured as it looks in the photos?

Yesterday I contact Steve Gregori and he suggests a top coat of Beoshield T-9 on top of the black phosphate to keep it from rusting.

Gary

[Brian K.]

Re: 1966 L79 crank pulley finish: black phosphate coated with Parkolac 30

Hi Gary, no the texture is exaggerated in the photo's I use an old camera for posting on the internet since it keep picture file size to 60-70KB and aids in quick post for me (less pixels and I live out in a rural area and use a aircard for internet). I've been a professional autobody tech/ painter for 30 years and no flat black paint looks like black phosphate. Like I said before the phosphate seams very fragile and not too rust resistant, I'm happy with the flat clear I used, I tried it on the back side first to see if any change to the finish would happen all it did was even it out.

[Gary B.]

Re: 1966 L79 crank pulley finish: black phosphate coated with Parkolac 30

Brian,

Makes sense.

I know that flat black paint won't have the sparkle that one expects to see with black phosphate. The thing I painted rather than treated with black phosphate was the rear strut rod cam assembly since I wanted just the bolt dark and not the cam. I'm betting that no one will ever consider taking a deduct for that.

Gary

[Brian K.]

Re: 1966 L79 crank pulley finish: black phosphate coated with Parkolac 30

I bet the judge's won't fit and the little lights and mirrors will never give it away. LOL

[Brian K.]

Re: 1966 L79 crank pulley finish: black phosphate coated with Parkolac 30

Here is a couple pics of my frame and those strut rod bolts. I hope to drop the engine and trans into the frame next weekend, I wanted to get them in this weekend but mothers day and all the grass cutting and it was a no go.

MVC-001S.JPG

MVC-002S.JPG

[Joe R.]

Re: 1966 L79 crank pulley finish: black phosphate coated with Parkolac 30

Hi Brian,

I like your brackets that are attached to the calipers to make your chassis a roller!!!

Joe

[Brian K.]

Re: 1966 L79 crank pulley finish: black phosphate coated with Parkolac 30

Thanks Joe, I didn't have any old wheels and tires and it's easier to roll it around this way.