1974 Mercedes 450SL with a 6.0 L LSx V8 – Part 1 This 1974 Mercedes 450SL (R107) is getting a new heart thanks to its owner Metalman 329. The plan is to replace the factory 4.5 L V8 with a 6.0 L LSx V8 (Vortec 6000) from a 2004 Chevy 2500HD truck. ...