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M2 Race Systems - Heads & Kits GM LS1/LS6 GEN III Buy the M2 Race System OEM Cylinder Head (comes bare and ready to assemble), along with the Valve Kit Pack (not installed in head). You assemble the Head & Kit together. To Order Online: Click Here   Flow Specs (CNC Machined) Cyl. Head Description Lift 2.02" Int. 1.60" Exh. # CH-1346 $1075/Pair (Bare) Ready to Assemble Bore: up to 4.030 .100 66.4 cfm 53.8 cfm .200 140.8 cfm 114.1 cfm .300 195.5 cfm 159.8 cfm .400 252.3 cfm 190.2 cfm .500 292.2 cfm 206.1 cfm .600 317.2 cfm 220.2 cfm LS1/LS6 Head Kit Pack (.625" Max Lift) Kit Description (8) 2.02" Stainless INT Valves # HK-2000 $489.99 Not Installed (8) 1.60" Stainless EXH Valves (16) Set of 1.289" O.D. LS1 Dual Valve Springs (140@1.800" / 385@1.150") (1) Set Titanium Retainers (1) Set Spring Cup Locators (1) Set Super 7° Valve Locks (1) Set Positive Viton Seals

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