31mm Big Foot Lifters have 15% more surface area than stock lifters to reduce friction and wear. 31mm Big Foot Lifters prevent scuffing and premature lobe wear on ultra high lift cams. They are manufactured from one-piece hardened billets. The 31mm lifter base is chill quenched to Rockwell 53 to match the hardness of high performance and OEM camshafts.

31mm Big Foot Lifters are precision ground to computer-plotted radius to increase cam life under increased valve spring tension, lift, and RPM. They feature ream bored oil passages and are designed to take the punishment of fast opening and closing rates. 31mm Big Foot Lifters are shipped in matched sets of 8 for use in all 40hp, 13, 15, and 1600cc based engines.