SBC 165cc I/E SS Head 67cc S/P 2.02/1.60 Bare

The SBC 165cc I/E SS Head 67cc S/P 2.02/1.60 Bare from DART is purpose-built for serious small-block Chevrolet engine builders seeking maximum flow and combustion efficiency in naturally aspirated and moderately boosted applications. This bare cylinder head delivers the foundation for high-revving performance builds, street-strip combinations, and racing engines where port velocity and chamber design directly impact horsepower and torque output. Whether you're refreshing a vintage 350 or building a modern 383 stroker, this head addresses the core limitation many OEM castings face: inadequate airflow and poor combustion geometry at elevated RPM.

The 165cc intake and exhaust port volume is engineered to support sustained flow rates without sacrificing velocity—critical for scavenging efficiency and throttle response below 6,500 RPM. The 67cc quench pad (squish area) reduces end-gas detonation by forcing fuel mixture toward the spark plug for faster, more complete combustion, allowing higher compression ratios or boost levels safely. Stainless steel exhaust seats resist thermal cycling cracking, extending durability in high-heat environments, while the 2.02-inch intake and 1.60-inch exhaust valve diameters are optimized for the small-block bolt pattern and gasket surface area. The bare configuration means you control rocker arm ratio, valve spring pressure, and pushrod geometry to match your specific build intent—essential flexibility for engine builders who demand precision tuning over one-size-fits-all solutions.

This head suits builders targeting 400+ horsepower naturally aspirated engines or moderate forced induction applications where stock architecture limits potential. Proper installation requires attention to deck height clearance, pushrod length verification, and valve-to-piston clearance—especially critical in stroker engines where increased piston travel demands taller quench pads. Pair this head with corresponding intake manifold, fuel system, and ignition tuning for optimal results; the bare design gives you complete control over final assembly specifications. Expect professional machine work (valve job, seat angles, port matching) to unlock full potential and ensure longevity in competitive or street-driven environments.