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Oval track - 4 & 7 Swap Firing Order Mechanical Flat Tappet Camshafts with 1-8-7-3-6-5-4-2 Firing Order. Solid - 1/4 to 3/8 tight. 327-358 cid. 11:1 + 2bbl with good intake and exhaust. Uses COM-950-16, COM-978-16 valve springs and COM-800-16, COM-813-16 lifters