The LT6 is a radical departure from GM small-block tradition, incorporating engineering solutions commonly associated with limited-production cars without demanding the special treatment of those machines. ![]() But they dedicated just as much time to explaining the cooling system, and how the engine was made to be robust. LT6 engineers spent lots of time talking about how they achieved such impressive figures with this all-new 5.5-liter V-8: 670 hp at 8400 rpm, 460 lb-ft of torque at 6300 rpm, and an 8600-rpm redline. ![]() Cadillac's media launch for the CT5-V Blackwing was held at Virginia International Raceway last summer, and the cars presented no issues lapping all day in 95-degree heat with A/C on.) (We should note that the LT4 hasn’t shown heat-soak issues in the Camaro ZL1, the 3rd-generation Cadillac CTS-V, or the current CT5-V Blackwing. It was a rare miss for team Corvette, and while no one directly mentioned the LT4's issues in the LT6 presentation, the subtext was, "we know where we screwed up with the LT4-powered C7." Chevy fixed the problem by raising the supercharger cover starting with the 2017 Z06, but the damage to GM's reputation for building durable track cars was done. In track use, early C7 Z06s had a habit of hitting high engine temperatures and going into limp-home mode, something that led owners to file multiple class-action lawsuits against GM. ![]() ![]() Chevy Redefined the Z06 With the C8 Corvette
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