Cast-iron manifolds versus mid-length headers versus long-tube headers: Which one is best for you? In this episode of Engine Masters presented by AMSOIL, we again look to our loyal fan base to feed us ideas of power tests they want to see. Obviously, the long-tube headers are going to make the most power, but we wanted to find out what the difference really is versus shorter headers or even cast manifolds, so we can make the right decisions about price, sound, and ground clearance. The engine tested here is a BluePrint Engines 6.0L LS-based crate engine with BluePrint heads, a stock intake, and a Comp Cams roller cam. Engine Masters is presented by AMSOIL and supported by Mr. Gasket and Earl’s Vapor Guard.