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Rather than using the factory roller lifters, we went with Comp's retro-fit lifters that are significantly stronger and can accept a much more aggressive camshaft. These are perfect performance replacement lifters for blocks that originally came equipped with flat-tappet cams. Moreover, it will also fit both standard blocks and tall lifter bore aftermarket blocks. When compared to flat-tappet lifters, these lifters will decrease friction and increase longevity.