1.42" (36mm) x 3.57" anti-reversion intake valve, made of EN214N stainless steel, with flash chrome plated stem for use with standard iron guide. Stem is waisted for improved flow. The valve head and reduced stem design allows the intake gas charge to flow better into the cylinder, while the groove on the valve face reduces 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.
Verify which type of valve tip you need, see comparison picture.