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It looks like '68 would have been the last year.

Thanks for the reply, c4c5specialist. I put one can a couple of weeks ago, so I'll wait the recommended 6 months and try again. So far there have been no codes. The detonation is mild and noticeable only under light throttle at this point. Otherwise, the car appears to be running normally...

Anybody know? I've run a can of 12345515 through it, but the ping is still there in the typical operating ranges. I haven't washed the engine (referred to in the tsb). TIA.

And I know some that won't. Not every product works on every car and every color, and some may work better than others in any specific case. If you have to use Z6 to keep additional dust off, that's just more work. I derive no joy from work, and I have no reason to believe I would use the other...

I can't tell much difference in the shine. To me, that's as much due to orange peel and how much work the owner has put into the finish. The cars I've seen that look unusually reflective have no orange peel, for whatever reason. My main concern is not attracting dust. I used Gold Class...

Thanks for the help!

Based on the above info, I picked up some, and I'll give it a try. If anybody has suggestions on a conditioner to be used on the leather before applying 303, I'd be interested in those ideas, too. Thanks.

I'm looking for a product to use on the seats, and the website says it can be used on leather. If anybody's tried it, I'd be interested to hear the results.

FWIW, I had never put mine in the bag until I gave up on using it almost a year later- and then just to keep it from getting contaminated. Beforehand, it was 'stored' in newsprint that was replaced when it became saturated, and that was often. I didn't feel comfortable putting any pressure...

The most common name I've heard recently is 303 Aerospace Protectant. I haven't used it, though.

I'm not really sure about them, but maybe mine was made on Friday or something. I do agree with Ken about their usage, however. Also, be sure to shake it before and after use. I've had one in newspaper for months, and it still stains the newsprint and streaks the paint with excess paraffin. The...

Before using any type of sandpaper, I'd suggest trying a different level of polish. Meguiar's makes an entire line typically carried by auto parts stores that is numbered 1 to 10 with varying qualities. Generally, the lower numbers are somewhat more abrasive. Swirl remover is #9. I might try...

The '85 Z51 I owned had Bilsteins. There may have been several possibilities. See chart: http://corvetteactioncenter.com/tech/c4/susp_chart.html

Substantially noisier? I wouldn't say so. Fractionally noisier, perhaps. For normal driving and around town, it's not really noticeable. Under heavy throttle, of course, it gets louder. Actually, a lot of the noise, particularly on the highway, is the tires (different from the coupe/vert), not...

Rear ratios are more of an issue with 4-speeds than 6-speeds. The Z first and second gear ratios are short, anyway, and sometimes selections come down to whether they'd require an extra shift in the quarter or not. In any case, you'll be shifting more, and the highway rpm will go up, mileage...

Unfortunately, most of the noises you speak of are associated with the design of the drivetrain, and, to a lesser extent, all manual transmissions. Even manual C4's make similar noises. Some typical noises sound like marbles in a can or a bad throwout bearing. Depending upon how you release...

A fair amount of C4 owners are using Kumhos. Haven't personally heard any experiences from Z owners, but it's definitely another alternative.

You didn't mention how the car is used, but for daily driving, a fair number of people are switching to Toyo T1s or the similar Yokohama model. Not sure what the available sizes are. Haven't got to that point, so I can't add anything else, but searching should turn up something here or at...

Clearly, it's difficult to design and tune a free-flowing, quiet exhaust system. Judging by the comments of some people that have changed components and introduced objectionable resonance frequencies, the solutions can be worse than the problem. Seems to me that a significant part of the...

The stock feel is not overly light, precise or crisp, but some of that is due to the design and sturdier parts required. It might be worth checking to make sure the clutch fluid level is correct and that the clutch is disengaging fully between shifts. AFAIK, there aren't any different linkages...