Superlift's block kits include two cast iron lift blocks, and four U-bolts with factory type Hi-nuts and flat washers. The blocks are cast from Class 30 Gray Iron, the same material used by vehicle manufacturers for their spacer blocks. Our U-bolts are manufactured from low allow, high strength steel. The anti-corrosion finish is either Zinc or E-coat
5" Rear Block Kit for 1973-87 GM 1/2 Ton Pickup and 1973-1991 Suburban, Jimmy, and Blazer