Cool C4 1984-1996 Chevrolet Corvettes, America Sports Car. ZR1, Gran Sport, Lingenfelter, Callaway.



1990 Corvettes

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This is the Section for 1990 C4 Chevrolet Corvettes. GM continues the C4 Corvettes through 1996, there are 10 pages of 1990 Corvettes, be sure to take a look at all of the pages to see many different colors, wheel combinations, body kits, interiors, engines, tires, exhaust systems and tips on such models as the convertibles, coupes, ZR1, Callaway, Collectors Edition, Grand Sport, and more.








The ZR-1 (RPO ZR1) arrived as a 1990 model after much anticipation. At the heart of the ZR-1 was the 375hp LT5 engine. It was designed with the same V-S configuration and 4.4-inch bore spacing as the standard L98 Corvette engine, but was an otherwise new design with four overhead camshaft and 32 valves. LT5 engines were manufactured and assembled by Mercury Marine in Stillwater, Oklahoma, then shipped to the Corvette Bowling Green assembly plant for ZR-1 vehicle assembly.

For a limited time during 1990, dealers could order Corvettes destined for the new World Challenge race series. Merchandising code R9G triggered deviations from normal build, such as heavy-duty springs with FX 3. Owners could buy race engines from Chevrolet or build their own, and all race modifications were the owner's responsibility. Twenty-three 1990 R9G Corvettes were built.

An air intake speed density control system, camshaft revision, and compression ratio increase added 5hp to base-engines, up from 240hp to245hp (except coupes with 3.07:1 or 3.33:1 axle ratios which increased from 245hp to 250hp because of their less restrictive exhaust systems).

1990 Corvettes had improved ABS and improved raw control.

An engine oil life monitor calculated useful oil life based on engine temperatures and revolutions. An instrument panel display alerted the driver when an oil change was recommended.

The RPO VOl radiator and B4P boost fan were not optional in 1990, both made unnecessary by 1990's more efficient, sloped-back radiator design.

Two premium 200-watt Delco-Bose stereo systems were available, the top unit featuring a compact disc player. To discourage theft, the CD required electronic security code input after battery disconnect.

The instrument panel for 1990 was redesigned as a "hybrid," combining a digital speedometer with analog tachometer and secondary gauges. A supplemental inflatable restraint system (SIR) with airbag was added to the driver side, a glove box to the passenger side.

The "ABS Active" light was removed from the driver information center.

Seat designs were the same for 1990 as the previous year, except the backs would latch in the forward position.

Chevrolet service departments returned LT5 engines to Mercury Marine for certain repairs. Customers had the choice of a replacement engine, or return of their original engine if repairable.

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