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Intake Manifold Dual Plane Low Rise Compatible with Chevy BBC BB Big Block 396 402 427 454 - Hex Autoparts, 20217 Hex Autoparts 20217 Compatible with '66-'90 396, 402, 427, and 454s with general duty oval port heads. Does not fit tall deck blocks. Oval ports, 180° dual plane design for power from idle to 6000 RPM. Dual Plane design for optimum fuel distribution, accepts square bore Holley 4150/4160 style carburetors. Ideal port position - steel mold cast to reduce core shift. Four corner water outlets. Cast-in bosses on intake runners, can be drilled and tapped for use with nitrous injectors.

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