In 1968, the 273 was replaced by the 318 cu in (5.2 L) LA engine as the smallest V8 available, and the new 340 cu in (5.6 L) LA four-barrel was released. The 383 Super Commando engine was upgraded with the intake manifold, camshaft, and cylinder heads from the Road Runner and Super Bee, but the more restrictive exhaust manifolds specific to the A-body cars limited its output to 300 bhp (224 kW).[9]