This SFI 18.1 Approved Balancer is designed specifically for High Performance Big Block Chevys. Lilke all Innovators West Balancers, it features an all aluminum case design for light weight, stress-proof steel hub and 1040 steel inertia rings for durability. Wet clutch friction design style with precision machined harmonic dampening for street and race engines. The #104 damper is for any BBC making up to 2000 hp. For engines making over 2000 hp we reccomend the #106 BBC Super Duty damper.