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RPM 3400-7200, Max lift .558/.549.
Oval track - 4 & 7 Swap Firing Order Mechanical Flat Tappet Camshafts with 1-8-7-3-6-5-4-2 Firing Order. The Com-12-688-47 is solid - 3/8 to 1/2 tight. 360 + cid. 12:1 + 4bbl with good intake and exhaust. Uses COM-950-16 valve springs. Also uses COM-813-16 and COM-800-16 lifters.
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