Exhaust Port Blockoffs Aluminum Spread Port

The Exhaust Port Blockoffs Aluminum Spread Port from Ti22 PERFORMANCE (TIP5120) is an essential modification for small-block Chevy engine builders and performance enthusiasts looking to optimize cylinder head flow and eliminate unwanted vacuum leaks. These individual aluminum blockoff plates seal unused exhaust ports on spread-port cylinder heads, a common configuration found on classic and modern small-block Chevy platforms. Port blockoffs are critical when converting to different head styles or running aftermarket heads with port configurations that don't match your engine's original design.

Manufactured from high-grade aluminum and finished with black anodize coating, these blockoff plates provide corrosion resistance and a professional appearance while maintaining lightweight characteristics essential to engine performance. The spread-port design specifically accommodates the larger, more widely spaced port pattern common in modern cylinder head designs, ensuring a precision fit without modification. Black anodizing not only protects the aluminum from oxidation but also helps dissipate heat more effectively than raw aluminum, contributing to long-term durability in high-temperature exhaust environments. Each plate is engineered to seal completely, preventing vacuum leaks that would otherwise compromise idle quality, fuel economy, and emissions control system function.

Serious engine builders and restoration shops rely on exhaust port blockoffs when installing modern cylinder heads on classic small-block Chevy platforms or when upgrading to high-performance aftermarket heads with non-standard port counts. Installation requires basic hand tools and gasket material; blockoffs simply bolt to the cylinder head in place of unused ports using existing bolt holes. This solution eliminates vacuum-related tuning issues that arise from open ports and ensures your ignition timing, idle quality, and emission system calibration remain stable. Whether you're rebuilding a street engine, preparing a competition build, or restoring a classic Chevy, these Ti22 PERFORMANCE blockoff plates deliver precision engineering at a fraction of the cost of custom porting or head modifications.