.020 Inch Oversized Piston and Pin for 79-86 CJs, SJ, J-Series 87-90 YJ, w/ 4.2L Eng Crown Automotive. 020 inch Oversized Piston and Pin for 1979 1986 CJ 5, CJ 7, CJ 8, SJ, J Series 1987 1990 YJ Wrangler, w 4. 2L Engine Features and Benefits: (6) Required . 020 inch Oversized 12 Month Warranty For Model w 4. 2L (6 258) Engine Sold Individually Use Existing Hardware Details: Material: Aluminum, Steel Finish: Unpainted Hardware Included: Use Existing Hardware Interchange: J8134441. 020 Application: 1979 1983 Jeep CJ 5 w 4. 2L (6 258) Engine; 1979 1983