HONDA H-SERIES DOHC VTEC (H22A). BLOX RACING BLOCK GUARD. BLOX RACING ENGINE BLOCK GUARDS HELP STRENGTHEN AND SUPPORT THE UPPER CYLINDERS WALLS IN OPEN-DECK HONDA / ACURA ENGINES. CNC-MACHINED FROM AL6061, THE BLOX RACING ENGINE BLOCK GUARD ALSO PROVIDE MAXIMUM COOLANT PASSAGE TO THE HEAD MINIMIZING THE RISK OF HEAD GASKET FAILURE AND CRACKED CYLINDER SLEEVES.