The 289 High Performance bottom end isn't much different from what we find in 2V/4V engines. It has the same 1M cast-iron crankshaft and C3AE connecting-rod forgings. Pistons were cast from the factory, and most rebuilds use forged. If you're nervous about the cast crank, relax. Carroll Shelby went racing with this crankshaft and spanked Corvettes in the process.