The Evernham-supplied 358ci small-block is a real-deal NASCAR Cup motor slightly de-tuned with lower compression. The headers are also from Evernham, and Year One tweaked some of the tubes to get them to fit. The motor plate and radiator core support are also modified Cup items. The custom air cleaner assembly is a custom piece designed to draw air from the cowl. Like all Cup motors, fuel supply comes from a mechanical pump driven off of the motor.