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Manufactured from A356 T-6 aluminum. Features 2" intake valves, 1.625" exhaust valves. Spring travel and valve clearance for cams up to .640" lift. Heads come assembled; include a flange-style intake manifold and top end gasket kit. Accepts stock Twin Cam rocker boxes (with slight machining) and rocker arm supports. Valve spring pressure: 175# closed, 300# at .600 lift, 89cc combustion chamber. Sold in pairs. Made in the U.S.A..