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Brodix offers the 195 heads with a 987 spring package (135/345) designed for hydraulic-roller cams. To ensure adequate spring pressure for the aggressive ramp rates used on the XFI cam, we further upgraded the valvespring package (180/435 pounds). Since the Brodix heads came equipped with guideplates, we replaced the self-guided roller rockers with a set of Pro Magnum roller rockers from Comp Cams. The rocker swap retain the 1.6 ratio used on the stock heads.