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Engine controls were monitored by the GMP4 powertrain control module (PCM), an on-board 64-kilobyte computer. A new exhaust set-up with a wider catalytic converter reduced restriction by 38% from 1990, while the 0-60 mph speed went from 9 seconds in 1990 to 8.2 for 1991. Revised engine mounts decreased cabin noise and vibration.
Depending on components and computer module the Vortec 5700 produces 255 hp (190 kW) to 350 hp (261 kW) at 4600 rpm and 330 lb⋅ft (447 N⋅m) to 350 lb⋅ft (475 N⋅m) of torque at 2800 rpm. [ clarification needed ] [ citation needed ] Known as the GEN 1+, the final incarnation of the 1950s-vintage small-block ended production in 2003.