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The turbo/intercooled Syclone engine is the latest variant off the famed GM 90° small block engine platform. Application is specifically to the Syclone short wheelbase all wheel drive pickup truck to be marketed by GMC in 1991. The engine project was a joint venture between General Motors Powertrain Division and PAS TRIAD of Troy, Michigan. Engine manufacture will originate at the GMPD Romulus 4.3L plant with final assembly at the Shreveport vehicle assembly facilities of GMC Truck and Bus and PAS TRIAD. Features of the engine include: High specific performance (1430 KPa BMEP) Air to water intercooling with an independent cooling loop. Electronically controlled wastegate for boost and knock control. High dynamic range multi-port fuel injection. Communization with standard 4.3L engine where possible to facilitate manufacturing process and quality management.

Two new 4.3 liter engines with 90° V-6 configurations were developed for use in Chevrolet's 1985 light duty trucks and rear wheel drive passenger cars. The new engines were optimized from the standpoint of oil sealing, performance, and fuel economy. A four-barrel quadrajet carburetor mounted on an open inlet plenum is used for truck applications and a 1×2 throttle body injection system mounted on a similar open inlet plenum is used for passenger car applications. Both engines are designed for optimum engine breathing and cylinder charging, and each requires a specific engine/emission control system. These engines are configured for even firing, have swirl inlet ports, and fast burn combustion chambers. The results obtained through the extensive engineering development program met and/or exceeded the program goals for performance, oil and coolant sealing, and fuel economy.