Rhoads 9008X V-Max Anti-Pump Flat Tappet Lifters Set for 1962-1989 Ford 221, 351C, 351M, 351W, 400, 429, 460Lifter Outside Diameter (in.): 0. 874 in. Quantity: Sold as a set of 16. Rhoads V Max Flat Tappet Lifters For maximum increases in low end torque, engine vacuum, and improved idle quality, Rhoads V Max variable duration flat tappet lifters are the answer. These unique lifters are designed to significantly increase low end torque and engine vacuum. This makes them the best choice for hot street, performance marine, and all racing applications. Typical