General Motors introduced the third-generation small-block V8 engine, the 5.7-liter LS1, in conjunction with the new C5 Chevrolet Corvette in 1997. That launch marked the beginning of the LS engine platform that would power GM cars and trucks for more than a decade while maintaining the architecture of the original small-block Chevy engine it replaced. Starting in 1999, heavy duty pickup trucks and large SUVs from Chevrolet and GMC would get a new LS-based engine, the LQ4. The 6.0-liter
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