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Rocker shaft

Triumph Rocker kit
roller tip type, with needle bearings, valve lift: 1.5:1

Triumph TR2, TR3, TR3A, TR3B, TR4 and TR4A (1953-67)

Rocker shaft whose rocker work with increased stroke. Allows better filling of the combustion chamber than with the standard camshaft.
If high ratio rocker kits will be fitted always check valve clearance to block and pistons, may be additional machining is required. Also check the lift capabilities of the valve springs for coil binding. Alternatively fitting of a cam with lower valve lift is required.