Replacement REPB311903 Upper Intake Manifold - Kit 3.8L V6

The Replacement REPB311903 is an upper intake manifold kit designed as a direct OEM replacement for 1995–2005 Buick Park Avenue equipped with the 3.8L V6 engine. This kit restores proper air distribution to all six cylinders, ensuring optimal fuel delivery and engine efficiency.

Key Features:

• Direct OEM Replacement: Precision-engineered to match the fit and function of the original factory intake manifold
• Plastic/Nylon Polymer Construction: Durable manifold body resists cracking and warping under normal operating conditions
• Manifold Height: 6.5 inches — matches factory specifications for bolt-on installation
• Single Plane Plenum Style: Designed for smooth, balanced airflow across all six intake ports
• Port Specifications: 6 intake ports with 36 x 45 mm port outlet dimensions
• EGR Ready: Compatible with factory EGR system — no modifications required
• Gaskets Included: Kit includes intake manifold gaskets for a complete, leak-free installation

OEM & Cross-Reference Part Numbers: 12537425, 106001, 217-454, 871601, 24506013, 89017272, 89017274, 615-180

The original upper intake manifold on these vehicles is a known failure point — the internal PCV valve can become dislodged over time, leading to oil consumption and rough running. This replacement kit addresses that failure with updated construction for reliable, long-term performance.