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Andrews Cams Evolution Big Twin

The Big Twin Evolution engine is ideally suited for the installation of hotter cams. The cylinder head design combined with the latest hydraulic lifters allow 6000 RPM and more even with Original valve springs. For maximum performance we recommend the use of adjustable pushrods.

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Late 1984–early 1986 Evo engines require the piston valve pockets to be enlarged for correct valve-to-piston clearance.