Chevrolet Corvette (C4)

Start with identity, paperwork and originality. For the Chevrolet Corvette (C4), the strongest cars have a continuous ownership file, VIN and build-sheet consistency, original window sticker where possible, and evidence of major service work by recognised Corvette specialists. Original paint, unmodified interior, complete option documentation, factory window sticker, low mileage, correct wheels and — on ZR-1 and Grand Sport cars — matching-VIN documentation and the ZR-1 valet key are all material.

Small-block V8s (Crossfire L83, L98, LT1, LT4) are durable when serviced; the ZR-1's LT5 is a very different engine — Mercury Marine-assembled, quad-cam and expensive to overhaul, so service history is decisive. A proper pre-purchase inspection includes cold-start behaviour, compression or leak-down testing where appropriate, factory-tool diagnostic scans on later cars, underbody photography, suspension and chassis-point inspection, brake condition and a road test long enough to expose heat-related faults. Deferred maintenance is almost always more expensive than buying the better-sorted car.

Corvette bodywork is composite (SMC / fibreglass), so a paint-depth gauge alone can mislead — inspect panel fit, factory seams, bonded joints and known repair signatures with a specialist. Frame or birdcage-equivalent structural repair, poor paintwork, filler in composite panels and missing factory trim all affect value materially. Documented cosmetic restoration is acceptable; concealed accident repair must be priced severely.

ZR-1 (LT5), 1996 Grand Sport (LT4 manual only), 1996 Collector Edition and the sharpest late 1993–96 LT1/LT4 six-speed coupes are the clear collector tiers; early Crossfire and L98 automatics remain usable but do not lead the market. Colour, transmission, option packages and limited-build variants move values significantly. Buy the best-documented example in the most desirable specification you can justify rather than a tired example of a rarer derivative that will need years of corrective work.