1.44" X 3.57" anti-reversion intake valve. The valve face design allows the intake gas charge to flow into the cylinder, while reducing the tendency to back up once the piston has reached bottom dead center. This effectively gives you a more efficient intake port, and is particularly beneficial in an otherwise unmodified head. Sold each.
Made of EN214N Stainless Steel, with flash chrome plated stem for use with standard iron guide. Stem is waisted for improved flow, swirl polished, and has a stellite hardened tip.