Hey guy's. I am thinking of buying a c-4, between 86 and 89. What is your opinions?
If you look at the accessory catalogs like Mid America, Eckler's, Corvette Central you can get an idea of what was improved from year to year on C4's by the "improved" parts they sell, like the retractible headlights.
I own an 88 and I'm pretty happy with it. The cost of restoration parts for things that break a lot or wear out on C4's (weatherstripping, door trim, interior components, alternators and engine electronics) is getting steep.
My advice - find the newest, low milage C4 you can, check it out very carefully - make sure all the expensive little doo dads like electronic air conditioning control, power seats, Anti lock brakes - work before you buy it. Look for water leaks thru weatherstripping, oil leaks, coolant leaks. Don't waste your money on a fixer upper: repair parts are expensive and dealerships don't like working on the older ones. There are lots of clean, well cared for C4's out there so you may as well take your time, shop around and buy a good one.
Also keep in mind that with 10 to 20 year old Corvettes and boats - a lot of things that go wrong have to do with the passage of time, not necessarily hard use. Wiring gets brittle, connections corrode, weather strip shrinks with age and will cause leaks, for example. Leather seats get brittle and may crack. You get the idea.