If you do decide to build that LS1 in disguise, you're going to need the internal parts. We discovered the eBay store of BBJ Automotive Cores. Specializing in late-model GM engines and parts, owner Billy Ingram told us 95 percent of his sales are from online customers. He buys engines from wrecked cars, disassembles and inspects all the parts, and sells everything that meets his standards for very reasonable prices. You could build an entire engine, complete from intake to oil pan with a complete accessory drive just by shopping from his site.