5.7 Liter GM LT Gen V | Aluminum Block Engine | Port Injected | Factory Mast HeadsPort Fuel Injection Long Block + Factory Mast Long Block (+) Crate Engine Combination What is a long block plus? It is a budget conscious complete long block that you can simply add the final touches to for a complete engine package. With so many options to choose from, you can pick what you need for each application and vehicle integration. Factory Mast Starts with the GM LT Base (GenV) engine and carefully assembles for maximum quality and