However, considering *factory-produced* small-block Chevys (generally referring to engines with a displacement under 400 cubic inches), the contenders for "most powerful" typically revolve around the late-model LS-series engines found in Corvettes and other performance vehicles. Specifically, some highly tuned versions of the LS7 (7.0L, found in the C6 Corvette Z06) and certain iterations of the LS9 (supercharged 6.2L, found in the C6 Corvette ZR1) could be argued as contenders. Determining the single most powerful is difficult due to variations in factory tuning and optional equipment.
If we're talking about *modified* small-block Chevys, the power ceiling is essentially limitless, depending on the budget and the level of modification. Many custom-built and heavily modified small-blocks easily surpass 1000 horsepower. Thus, there's no single "most powerful" in this category.
