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These camshafts use COMP's new XTQ intake profiles with the XTX exhaust profiles for more area under the curve that most good .875 lifter designs. Southern Sport Mod. solid 3/8 to 1/2 fast. 327-358 cid. 11:1, 2 bbl with good intake and exhaust. Uses COM-987-16 and COM-950-16 valve springs. Also uses COM-813-16 and COM-800-16 lifters.