1990 Callaway Twin-Turbo Corvette Illustrated Series No.85

Here's the story:
lllustrated Corvette Series No. 85 - 1990 Callaway Twin-Turbo

While the ZR-1 was getting all of the attention from the automotive press, Reeves Callaway was quietly building his own "blessed by Chevrolet" super-Corvette, the Callaway Twin-Turbo.

The ZR-1 was distinctively European inspired. The all-aluminum, double-overhead-cam engine reflected a different approach to speed. The Callaway effort was uniquely American. It started off with a great pushrod performance engine and add lots of go-fast parts. Both ways get you to 180mph. One version is subtle, the other is not. Both were available from your local Chevy dealer!

Styling was another distinction. As amazing as the ZR-1 was, to the untrained eye, it was just another Corvette. The Callaway aero body kit had all sorts of vents and scoops that let the everyone know that "something special" is inside." The price of admission was similar as well. Priced at $26,895, the Callaway option cost $121 less than the ZR-1. But a loaded Callaway went for over $66,000!

Callaway blueprinted and balanced the stock Corvette engine then added a new forged steel crankshaft with new 4-bolt main bearing caps, and Mahle 7.5:1 compression pistons. Aluminum heads with new valves and springs finish off the main block. Then the real meat is added. Twin Rotomaster turbos and intercoolers finished off the top of the new engine. A Callaway Micro Fueler II fuel pump worked through stock injectors. The Z51 chassis option added a power steering cooler, stiffer spring rates, larger front brake rotors and calipers. A GM/ZF 6-speed transmission was used, along with the factory adjustable suspension. The custom body kit finished the exterior while the interior was stock.

Only 58 units were sold in 1990, making this a very rare, very expensive, 180mph Corvette!