Lifter bushings? Well, your shop can get them. It's amchining operation, where the lifter bores angles are corrected, and the bore itself is bored larger, then a bronze bushign is installed in the bore, and finish honed to proper size. With rollers, should a part fail between the valve stem and lifter, or the lifter itself, the bushings keep you oil presure up. The cam profiles kick the lifter out of it's bore at that point. Otherwise, by the time you figure out what happened, the lower end is beat up. It also correct a lot of poor factory work that is very common in factory blocks. At my shop, it costs $300 plus the bushings for that operation, many shops do not have the equipment to do it tho. So ask first. A hydraulic roller does not need that procedure, only solid rollers. And yes, you can run it without them, just be very careful with lifter choice,and IMO, it's a poor gamble with a street car.
