SBC 245cc Pro-1 Head CNC 66cc A/P 2.100/1.60 Bare

The SBC 245cc Pro-1 Head CNC 66cc A/P 2.100/1.60 Bare by DART is engineered for serious engine builders and performance specialists who demand precision cylinder head architecture for high-displacement applications. This bare casting serves as the foundation for competitive small-block builds where displacement, air-flow efficiency, and valve timing optimization are mission-critical. Whether you're assembling a street performance engine, competition platform, or custom power plant, this CNC-ported head eliminates guesswork and delivers the geometric precision required for consistent combustion efficiency and maximum horsepower extraction.

Built for the SBC (Small Block Chevy) platform, the Pro-1 head features CNC-machined porting optimized for a 245cc intake runner volume and 66cc combustion chamber, paired with 2.100-inch intake and 1.60-inch exhaust valves—specifications that balance low-to-mid-range torque with peak-RPM cylinder fill. The bare casting design allows builders complete freedom in valve selection, spring rates, and rocker-arm geometry without pre-installed components limiting performance tuning. CNC precision ensures port-to-port repeatability across multiple heads and eliminates flow inconsistencies inherent in hand-ported castings, critical when building dual-quad or fuel-injected engine systems where vacuum signal stability and combustion uniformity directly impact drivability and reliability.

Ideal for engine builders, performance shops, and enthusiasts constructing 383–427 cubic-inch displacement small-blocks, the SBC 245cc Pro-1 Head integrates seamlessly with standard small-block manifolds, carburetors, and fuel-injection systems. The bare configuration demands proper valve installation, seat work, and spring assembly by experienced technicians, making it essential to pair this head with quality components and dyno-proven specifications. At 21.44 lbs per unit, weight remains minimal, preserving engine bay balance and supporting weight-reduction goals in street, strip, or road-race applications. Installation requires attention to deck thickness, gasket selection, and proper torque sequencing—standard practice for any serious engine assembly.