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http://www.deckernut.com/about.htm
'Decker Manufacturing Corp' (DMC) but NO idea when your lug nuts were manufacturered, maybe you can research within their parts line?
The Options PDF is always helpful on those kinds of questions. Also look at D80 about the spoiler issue.
My 12D 68 does have U73.
Or are we all mistaking your question? Do you mean when it happened in the assembly process?
I don't know what the DMC stands for, but as Kurt has said there were sometimes more than one vendor for the same part. I have a original waffle style set on my car, although I do not know if this would have been correct.
you can remove the jack head, and take the mast to a local plating company... and reassemble yourself..
Don-
Here is some good info on alignment with the Polyglas tires:
http://www.camaros.net/forums/showthread.php?t=193367
Although I was asking about info for my 68, your 69 should be similar. I followed David Pozzi's alignment recommendations and my car drives very nicely with Polyglas F70-14s all the way around. No 'wander' or 'pull' at all. My car has all new suspension bushings, and the suspension bolts were all tightened to factory specs after the suspension settled.
My 12E '68 came with one.
Jim
My favorite tire on my Z was always the Goodyear Polyglas. The pic attached may be hard to see, but the tires are H60-15 and F70-15 Goodboots on the factory YH rims - these tires were on the car from '76 until a couple of years ago, when I finally sold them at the local auto flea market. Yes, they were a handful to drive, but a cooler tire never lived. Trips to the local 25 cent car wash always included a Brillo pad to clean the letters with -
Bias ply tires generally follow the ruts that are really on any road, interstates included. Ever notice how you can hydroplane easier in the right lane at speed on an interstate ? It's because of the slight depressions from trucks and heavy traffic in that lane, constantly, that funnel water in the lane, causing it to puddle and wedge under the tires. Radials resist it better, but bias ply builds are more sensitive to changes in the road surface. Couple that with manual steering, quick ratio, and these things were a challenge to drive - but I still love them (for the look !).
Driving my Pace Car home after purchase, some 125 miles in several July thunderstorms, was downright horrendous after so many years of radial tire equipped company vehicles (at high speeds). Car was all over the road, darting everywhere, hydroplaning, and drifting from side to side. First purchase after I got it home was a set of B.F. Goodrich Radial T/A's, which dramatically cured the ills noted on the ride home. I resolved never to run bias plies on the street, but as a show tire Goodyears still have the charisma.
Shame that Goodyear can't build a radial that looks like a Polyglas GT or Wide Tread GT of old -
Regards,
Steve
If I recall the earlier alignment specs, there should be a certain amount of toe-in so when the car moves forward the road will force it outwards to take up any minor play in the steering. If the toe in/out is perfect then the steering can be prone to wandering, which what it sounds like you are experiencing.
Mike
that's one of the 'characteristics' of bias belted tires... Fun huh?
Try tightening up the steering box. I did and it really helpedX2... and alignment?
Were the alignment specs for your bias belted tires followed when the tires were put on the car? Toe-in?
http://www.camaros.org/forum/index.php?topic=3913.0
http://www.camaros.org/forum/index.php?topic=4656.0
Did the people you had rebuild your car drop it on it's feet before tightening all the suspension bolts?
