Here is the Intake Manifold Part Number. Pontiac used various Part Numbers and even the same numbers on different parts. No, even though the part number may indicate a 389 or 421 Superduty Intake Manifold, it ain't Aluminum, Duh!
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Title: Manifold Numbers
Description: Here is the Intake Manifold Part Number. Pontiac used various Part Numbers and even the same numbers on different parts. No, even though the part number may indicate a 389 or 421 Superduty Intake Manifold, it ain't Aluminum, Duh!