ORIGINAL: pauly
The 968/S2 cam chain seems to be consumable item, if the chain is worn so are the cam sprockets, it's not good engineering practice to replace one without the other.
At last! Someone else who agrees with what I have been saying for years... It is just basic engineering as you say.
Is an S2 cab worthless if it hasn't had cams and a hood etc.? That's an interesting question. I guess if it is accepted that the work will be necessary for all S2s based on mileage (age being similar for all and therefore constant and ruled out), and that the work is around 3,000 Pounds to complete then a car which has not had the work should be worth that amount less than one which has had the work.
There are some variables of course, for example;
there is value in knowing exactly what work was done, who did it and to what standard and that could lead a buyer to prefer to have it done post purchase, however that is hassle and there is value in buying something already done and hassle free. Personal choice I think; and
it is clearly not an absolute at what point the work will need to be done.
As I described earlier there is an S2 cab for sale locally (relatively speaking) to me that I had some interest in buying, however as I suspect it has not had its cams replaced then I am not interested (at its current price at least, and also as I don't know anyone I'd necessarily trust with the job, nor even know how much it might cost to rectify here). Someone else will probably buy it and might get burned, but I won't:
I got burned when I bought my S2 coupe. The indie I used at the time told me I either authorised new camshafts or he would reassemble the cam cover, push the car outside and let me turn the key to take it away - in other words after he saw the cams he was unwilling to take responsibility for running the engine again. I had bought that car very cheap (just under 4.5 grand in 1999), but it was LHD and had minor cosmetic damage to both front PU corners, and by the time that was fixed plus new cams and plate lift corrected it owed me more than it was worth. In fact I sold it a year later for pretty much what I paid for it and had to replace the clutch as well as the other stuff.
When I bought my S2 cab I paid 7,200 for it at a time when they were typically 9k+. It also needed cams, but as I bought it right I came out OK on that one, albeit I still had the brakes and suspension to overhaul.
My experience of Porsche buying is that you
very rarely get a car that has known (or likely) problems cheaply enough that you wouldn't have been better off paying a bit more for one that had already had the maintenance done.