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Application: 2020 Chevrolet Blazer, GMC Acadia with 2.0L-T Engine (RPO LSY)The 2004-I and up 4HK1 5.2L diesel uses a different Valve and Valve Stem Seal than the previous 4HE1 4.8L diesel. EN-47685 is sized to fit the new Valve and Install the Seal without damage.