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1984–1990 Chevrolet Corvette C4

The C4 Corvette modernized America's sports car with digital instruments, a clamshell hood, and Z51 handling that rivaled European exotics at a fraction of the cost.

1984–1990 Chevrolet Corvette C4 — Full Specifications

  • Engine: 350ci L98 TPI V8
  • Power: 230–245 bhp
  • Torque: 330–345 lb-ft
  • Transmission: Doug Nash 4+3 manual overdrive or 4L60 4-speed automatic
  • Drivetrain: Front engine, rear-wheel drive
  • Body style: 2-door targa-top coupe, 2-door convertible (1986+)
  • Wheelbase: 96.2 inches
  • Curb weight: 3,200–3,400 lbs
  • 0–60 mph: 5.7–7.0 sec
  • Quarter mile: 14.0–15.0 sec
  • Original MSRP: $21,800 (1984 base); $32,045 (1990 ZR-1)
  • Current value: $8,000–$18,000 (standard coupe); $15,000–$30,000 (convertible); $25,000–$50,000 (Callaway Twin Turbo)

Production Notes

There was no 1983 model year for production—only one prototype exists, housed at the National Corvette Museum. The Callaway Twin Turbo produced 382 hp. The 1990 ZR-1 with its DOHC LT5 engine (375 hp) elevated the C4 to supercar status.

Notable Factory Options

  • Z51 Performance Handling
  • Z52 Sport Package
  • Callaway Twin Turbo
  • FX3 Selective Ride
  • Doug Nash 4+3 transmission
  • Bose sound system

Buying Guide

The C4 Corvette is arguably the greatest performance car bargain in America today. A well-maintained Z51 coupe can be had for under $15,000 and delivers handling that embarrasses cars costing ten times as much. The 1986 convertible (first since 1975) is a classic open-air experience. 1988–90 models with the 6-speed ZF manual (replaced the problematic 4+3) are the most desirable standard models. The Callaway Twin Turbo is a factory-authorized package with serious performance and investment potential. Avoid cars with the 4+3 manual unless you're prepared for its quirks. Check for cracked dashboards ($1,500+ to fix properly), soft weatherstripping, and frame rust (inspect with a flashlight from below). The Z52 sport package is worth seeking out for its improved suspension and handling.

Pros

  • Incredible performance-per-dollar—nothing else comes close
  • Z51 handling is genuinely sports-car capable
  • Fiberglass body never rusts (but the frame can)
  • Callaway and ZR-1 models offer supercar performance
  • Enormous aftermarket and Corvette club support

Cons

  • Dashboard cracking is nearly universal and expensive to fix
  • Doug Nash 4+3 transmission is unreliable and expensive to rebuild
  • Early models (1984–85) have less refined suspension
  • Steel frame can rust under the fiberglass, hidden from view
  • Stigma of being 'cheap'—though this is changing as values rise

Restoration Tips

Dashboard cracking is endemic. Weather stripping deteriorates quickly. The Doug Nash 4+3 overdrive transmission is complex to rebuild. Check for frame birdcaging (rust in the steel frame under the fiberglass body).