If you're building a high-output small block Mopar and want serious airflow, durability, and race-winning potential, the Mopar Performance W9 Aluminum Cylinder Heads are engineered to deliver. These heads bring advanced features that make them a favorite among drag racers, late model teams, sprint cars, and high-end street builds alike.

The W9 heads are a premium aluminum design built for 48-degree tappet-bore race blocks (such as A8, A4, R3, or R4). They feature a 15-degree valve angle (some versions are 13° raised-port), a CNC-machined 62cc combustion chamber, and intake ports that flow approximately 290 cfm as cast. This level of flow makes them a powerful match for big stroker builds, especially for those who want to extract as much power as possible from their cylinder heads.

Every head includes enhancements for sealing integrity—extra head bolts per cylinder—and water-routing upgrades with three coolant outlets machined to accept AN-style fittings. These build-ready heads, sold bare (without seats/guides depending on version), give you the flexibility to match valve sizes, springs, and other hardware to suit your camshaft profile and power goals.

These are not entry-level heads; they shine in high RPM, high load, high demand scenarios—when you need reliability and performance under pressure. Whether you want a w9 engine build that takes you deep into the 7000-rpm zone or are looking for serious torque to haul at higher displacement, these w9 mopar heads give you a foundation that’s both race proven and tuned for major gains. Get them in your cart and set up your build for real power.