All Vertex Pistons Feature POLARIS RZR 900 2011-2013 COMPR 10,6:1 CAST. POLARIS RANGER 900 2011-2013 COMPR 10,6:1 CAST. POLARIS XP 900 2011-2013 COMPR 10,6:1 CAST. - All pistons are heat treated with a T-5 or T-6 hardening and tempering cycle.
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