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15 Because we're converting to a hydraulic roller cam, naturally, hydraulic roller lifters are required. For early blocks that didn't use a factory roller cam, you have two options; use the stock tie-bar and lifter retainer setup in the lifter valley with stock-type roller lifters, or aftermarket roller lifters linked together with a tie bar to prevent rotation. We opted for the aftermarket tie-bar-style retrofit lifter. Either way, the taller roller lifters usually need to be installed before the cylinder heads, otherwise you will not get them into the lifter bores.