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I have a Pr of World Products heads with Manley 2.00int and 1.60exh valves that have about 250 miles on them before I received them. I disassembled them cleaned and had the valves redone along with JUST surfaced. Heads CCed at 61.5cc. Installed new rubber valve seals, and Crane dual springs #99893. Installed height of 1.84 @116. The springs are rated at 300# @ 1.34 and 316 @1.29". These heads have a new Comp Cams 268H, new Crower Hyd lifters, new 3/8" studa and guide plates. with the whole deal.
 

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