SKU: HED27700
UPC: 732611277006
MPN: 27700
The HEDMAN Ford 289-351W Oval Port Gaskets (part number 27700) are exhaust header gaskets engineered for small block Ford engines with oval port cylinder head configurations. These gaskets seal the critical junction between the header and the cylinder head, preventing exhaust gas leakage that would compromise engine performance and create unwanted noise and fume escape.
Each gasket features a steel core laminate construction with 1.675 x 1.035 inch oval port openings, matched precisely to small block Ford cylinder head port geometry. The laminated steel core provides superior thermal stability and recovery compared to standard composite gaskets, resisting degradation from repeated heat cycling that occurs in the exhaust header environment. This construction maintains gasket integrity across extended engine operation and higher-temperature applications. The pair design means you receive both gaskets required for a complete header installation.
These gaskets are intended for engine builders, restoration specialists, and small block Ford enthusiasts performing header installation or replacement. Whether you're rebuilding a classic muscle car engine, upgrading to a performance header system, or restoring original equipment, proper gasket selection prevents air leaks that would lean out the air-fuel mixture and introduce parasitic exhaust leaks. Gasket failure manifests as persistent exhaust odor, performance loss, and difficulty tuning carburetor or fuel injection systems.
The oval port configuration is specific to certain small block Ford cylinder head families and differs from the more common rectangular port opening found on many aftermarket heads. Confirming your cylinder head port shape before ordering ensures proper fitment and sealing. HEDMAN's laminated gasket design remains a standard choice for precision header work where leak prevention and durability matter.
Supplied as a pair, these gaskets are ready for installation with compatible small block Ford oval-port headers and cylinder head combinations.
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