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2. The OE-style spring steel retainer, which is often referred to as a spider, and these lifter guides are what you’ll find in an OE late-model 5.0L roller cam engine. You can convert an early block with this hardware as one option; however a small-base-circle, retrofit camshaft must be utilized to prevent the lifters and guides from making contact at maximum lift. This kit from Comp Cams will retrofit a roller cam into 289/302, 351W, 351C, 351M, and 400ci Ford small-blocks.