Manley 12898-8 Street/Drag 2.250" +.350" Oversize Performance Engine Valves

The Manley 12898-8 Street/Drag series engine valves deliver high-performance reliability for demanding street and competition applications. Featuring a 2.250-inch head diameter with a +.350-inch oversize stem, these valves are engineered for builds requiring precise fitment in reconditioned or oversized valve guides.

Manley Performance has been a trusted name in high-performance valvetrain components for decades, manufacturing valves to exacting tolerances for maximum flow, durability, and heat resistance. The Street/Drag (S/D) series bridges the gap between OEM replacement and full race components, making them ideal for performance street builds, hot rods, and bracket racing applications.

Key Features:

• 2.250" head diameter for high-flow performance applications
• +.350" oversize stem for use with reconditioned or oversized valve guides
• Street/Drag (S/D) series — engineered for performance street and competition use
• High-quality stainless steel construction for superior heat resistance and durability
• Precision-machined to tight tolerances for reliable sealing and longevity

Manley's Street/Drag valves are a popular upgrade for builders seeking improved airflow and durability over standard OEM valves without the cost of full race-spec components. The oversize stem designation ensures proper fit in engines where valve guides have been bored to accept larger stems during reconditioning.