Update. I had another alignment done today at a different shop. This is after about 1000 miles max on the alignment I did last fall before the car went to bed. I wanted to get a before and after print out which was not provided to me by the shop I went to last year. The numbers reported now are the numbers I asked for. This was not expensive, $75, and I got a warm an fuzzy feeling from the technician who is all grown up, well regarded as a straight shooter, and experienced. He reported all the adjusters are working just fine which is good. I'm interested in your take on these numbers. He did not touch the front. I was listening to ZDan's recommendation to keep the rear toe in at the low end of the oem spec. I think I have that now although I do get confused by the way all these numbers are expressed in inches, degrees, decimal inches etc. I am driving 100% street - but sometimes in a "lively" fashion. I recognize there may be benefits, and downsides, to adding some camber front and rear and also to adding some more toe in the rear. But now I feel I have basically an oem alignment that gives me a base line for comparison. My first short drive left me thinking this is good for me. No need for anything more aggressive.

 

Assuming 25in tires the conversion is 0.436 inches per degree, or 2.29 degrees per inch.
So now you have 0.16in * 2.29°/in = 0.37° total rear toe-in, where previously you had 0.28in * 2.29°/in = 0.64° total rear toe-in. Big step in the right direction!

Or if you have a calculator with inverse sin you could get the angle in degrees by: sin-1(0.16in/25in) = 0.37°

Reducing rear toe-in from 0.64° to 0.37° total should give big improvements in handling responsiveness and in rear tire life
Also nice to have it symmetric

You can safely run less rear toe than the spec range (which IMO is a bit on the high side, by as much as 2x). I wouldn't consider running any more than the minimum end of the spec range... I generally run 0.2° total rear toe-in on the S2k, or .087in total, no prob on road and track. But yeah, see what you think and if you can tell any differences in handling behavior. And rate of rear tire erosion!

 

I had an opportunity to take a long drive yesterday on country roads with this new alignment. The car feels great to me. It is the first time honestly that I can say I am really happy with the alignment. Part of it may be psychological, knowing that it is aligned within spec all around. In the past there were little weird characteristics that bugged me. All of that is gone now. The car feels very planted and predicable, straight and smooth. I'm happy. Best $75 I have spent on this car. I think I'll check it again next spring and then periodically after that on a schedule that makes sense given the extent of any changes over the coming year. In the unlikely event that I ever buy another used sports car one of the very first things I will do is to get new tires and a good alignment. As it is, this took me less than a year - and what a difference it has made.

Next up is a valve clearance check, and valve adjustment as needed. I'm waiting on a valve cover gasket set that I have ordered. After that is done I'll have a baseline for this car as far as regular maintenance. Knowing the valves are not too tight will also contribute to my piece of mind. The car runs beautifully. Still, with all the ink on these pages about engines going south with tight valves as the root cause I am anxious to check this out. The engine is pretty quiet so I am just a tad concerned the valves may be on the tight side and I need to get this done asap.

I want to say how happy I am to have landed on this forum. This is a terrific forum. It has shortened my learning curve regarding the idiosyncrasies of this wonderful car in a major way. Thanks for all your seasoned and knowledgeable advice. I am in the process of reclaiming my love of cars and engines that has been in the deep recesses of my brain for almost 40 years. There was a time, in the distant past, when I used to do some off the wall things - like engine builds and engine swaps. I'm not going there again. But, I do enjoy doing maintenance and getting a car functioning the way it should.

What a joy this car is. Life is good.