Replacement Choke Cap

The Holley replacement choke cap (MPN 45-258) is an OEM electric choke component engineered for Holley 2300, 4010, 4011, 4150, and 4160 series carburetors. This precision part restores proper choke operation on classic muscle cars, street rods, and performance vehicles where reliable cold-start enrichment is critical. Whether you're rebuilding a carburetor or replacing a failed choke assembly, this replacement cap ensures factory-correct fitment and function without costly full-carburetor replacement.

Designed as an electric choke cap assembly, this component includes the required gasket seal to prevent fuel and air leaks at the choke housing interface. The cap mounts directly to Holley carburetor bodies and integrates with the electric heating element to regulate choke plate closure based on engine temperature and electrical input. Proper gasket sealing is essential—fuel weeping around a failed cap leads to rough idle, hard starting, and fouled plugs. This OEM-spec replacement maintains factory thermal characteristics and electrical continuity, restoring consistent enrichment cycles across the full warm-up range.

Carburetor builders, engine rebuild shops, and DIY enthusiasts working on 1960s–1980s performance engines benefit from keeping this cap in stock or on hand before disassembly. Direct bolt-on installation requires no modification or adaptation—it threads or bolts to the choke housing in under five minutes. If your Holley 4150, 4160, or 2300-series carb exhibits sluggish choke response, fuel seeping from the choke cap area, or won't hold idle during cold cranking, this replacement cap is the solution. Verify your specific Holley model number before ordering to ensure compatibility with your carburetor revision.