SKU: REM12-002
UPC: 878891001662
MPN: 12-002
The Exhaust Gasket for Pontiac 400-455 Ram-Air IV/SD/HO (MPN 12-002) is a critical component for engine builders and restoration enthusiasts working with classic Pontiac muscle cars from the muscle car era. This gasket seals the junction between your exhaust manifold and cylinder head, preventing exhaust gases from leaking and robbing your engine of horsepower and efficiency. Anyone rebuilding, restoring, or upgrading a Pontiac 400 or 455 big-block—particularly Ram-Air IV, Super Duty, or High-Output variants—needs a reliable, OE-quality gasket to ensure a proper seal and maintain peak performance.
REMFLEX exhaust gaskets are engineered with advanced composite materials that withstand extreme manifold temperatures and pressure cycles without degradation or blow-out. Unlike brittle cast iron or thin metal gaskets that can fail under thermal stress, REMFLEX's flexible construction allows it to conform precisely to manifold and head surfaces, creating an airtight seal even when bolt torque fluctuates. The gasket's 5.1 x 26.1 inch dimensions conform to Pontiac 400-455 specifications, ensuring proper port alignment and eliminating the need for custom modifications or expensive machine work. This design minimizes exhaust leaks that can cause power loss, increased emissions, and overheating of the manifold and adjacent engine components.
Street and strip builders favor REMFLEX gaskets for high-performance Pontiac engines because they resist failure across multiple heat cycles—critical for engines that see both street duty and track time. This gasket fits all Ram-Air IV, Super Duty, and High-Output 400-455 manifold configurations without requiring port matching or grinding, making it an ideal choice for stock-to-modified restorations. Installation is straightforward: simply position the gasket between the manifold and cylinder head, torque fasteners to manufacturer spec, and verify no exhaust leaks develop after the first heat cycle. Whether you're assembling a show car, daily driver, or competition engine, the Exhaust Gasket for Pontiac 400-455 Ram-Air IV/SD/HO delivers reliable sealing and longevity.
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