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Note the comparative size of Project Nova’s original 1½-inch headers installed by a previous owner (top), and the new Hooker Super Comp ceramic headers with 17/8-inch primaries. Bigger isn’t always better, although too small will hurt performance—and that was our case here. With over 500 lb-ft of torque available from our 400ci small-block at 3,700 rpm, and 523 lb-ft peaking at 4,400 rpm, a bigger tube was called for. We’ll have more on the science of primary tube sizing next month when we dive into our header story.