4500 Hly Base Gasket 4-Hole Pattern

The 4500 Hly Base Gasket 4-Hole Pattern (FEL-PRO MPN 1912) is a precision-engineered sealing component designed for carburetor and intake manifold applications where engine performance and reliability depend on a leak-free assembly. Built by FEL-PRO, an industry-trusted manufacturer known for OEM-quality gaskets and seals, this base gasket serves as the critical interface between your carburetor's mounting surface and the intake manifold or adapter plate. Whether you're performing routine carburetor maintenance, rebuilding a classic engine, or upgrading fuel delivery components, a high-quality base gasket is non-negotiable for preventing vacuum leaks and fuel seepage that compromise driveability and emissions.

This gasket features a 4-hole bolt pattern geometry optimized for carburetor bores and manifold flanges commonly found on mid-sized engine platforms. The design ensures even pressure distribution across all fastener points, eliminating hot spots and micro-leaks that develop under thermal cycling. FEL-PRO's material composition resists fuel, oil, and intake manifold temperatures, maintaining compressive set over extended operating periods—critical for engines that see regular use or performance driving. At just 0.12 lbs and measuring 6.3 × 0.25 × 6.5 inches, this gasket offers minimal bulk while delivering maximum sealing integrity, making it ideal for tight engine bays or custom manifold setups where space is limited.

Mechanics and engine builders trust FEL-PRO base gaskets for carburetor installations, intake manifold adapters, and fuel system modifications on street engines, race applications, and restoration projects. Proper installation requires clean mounting surfaces, correct fastener torque sequencing, and OEM-spec hardware to maximize gasket lifespan and eliminate reoccurring leaks. This gasket is compatible with standard 4-hole mounting patterns common across Holley, Edelbrock, and comparable intake configurations. Always verify your specific carburetor or manifold adapter's bolt pattern before ordering to ensure precise fitment and optimal sealing performance.