Engine Block Off Plates

When running a carbureted or naturally aspirated small block Chevy, sealing off unused exhaust ports is critical for preventing hot exhaust gases from escaping where they shouldn't—this directly improves intake manifold heat distribution and carburetor...

Blocking off unused exhaust ports on your Small Block Chevy prevents unwanted air leakage and ensures optimal exhaust scavenging, which is critical for maintaining consistent cylinder pressure and maximizing power output. These Allstar Performance plates...

Exhaust Port Blockoff1-PieceAluminumNaturalSmall Block Ford

Exhaust Port Blockoff1-PieceAluminumNaturalGM LS-Series

If you're running a Small Block Chevy engine with aftermarket heads or a custom build, exhaust port blockoff plates are essential for proper air sealing and preventing unwanted exhaust leakage. These Allstar Performance plates eliminate gaps at the...

Whether you're building a dedicated race engine, converting to a different fuel system, or eliminating unused ports on a stripped-down competition platform, the JAZ SBC Block Off Kit provides a complete solution for sealing off ports you don't need. This...

Keep your engine bay clean and your build looking sharp with the Allstar Performance Exhaust Block Off Plates for Small Block Chevy spread port heads. These solid aluminum plates are the perfect solution for blocking unused exhaust ports during testing,...

Keep your engine bay clean and protected when it's time to pull the heads or swap exhaust components. These Allstar Performance Exhaust Block Off Plates are a must-have for any serious Small Block Chevy build, sealing off exhaust ports quickly and...

Exhaust Port Blockoff1-PieceAluminumNaturalSmall Block Chevy

Exhaust Port BlockoffIndividual PlatesAluminumBlack AnodizedSpread Port HeadsKit

Whether you're building a dedicated race engine, converting to a different fuel system, or eliminating unused passages for a cleaner bay, the JAZ SBF Block Off Kit provides all the necessary plates to seal off intake, exhaust, water pump, and fuel pump...