Coupled with our latest release of the Pro Cas with -20 fitting, we have now finalized a solution for a matching high flow rear head drain designed to maximize flow through the cylinder head. The RB Twin Cam Pro Series Cooling Head Drain is engineered specifically for dry block with wet head type combinations, delivering superior high volume cylinder head cooling. Built for enthusiasts who demand precision and performance, this cooling solution enhances reliability and efficiency in your build. At Culture Automotive, we combine premium parts with expert knowledge to elevate every automotive experience. This is more than parts—it’s our culture.