Features: Work on Detroit-Series 50 and Series 60 engines for properly setting injector body height to the injector follower for proper fuel injector timing. Superior quality: Constructed from high quality Steel, our product has high toughness and shows its advantage in precise size and wide applicability. Advantage - Properly set injector body height to the injector follower for proper fuel injector timing. Incorrect injector timing can cause engine power issues, poor idle quality and fuel mileage issues. Compatibility: Injector Height Gauge works on Series 60 and 50-Engine DDEC II-Year 1986-1993, III-Year 1994-1997, IV-Year 1997-1998, IV-Year 1998-1999; Series 60-Engine DDEC III-Late 1997 and Marine-Year 2000-2003; Series 60 (Similar to J-42749, J-45002, J-39697, J-42665, J-35637-A). Easier Work: Be sure the height gage seats on the machined surface with the tip in the pilot hole. Adjust the height until you can slide over it and find that slight drag. Specifications: Material:Alloy Applications: Size: 78.2mm, Series: 60, Engine: DDEC I, Year: 1986-1993. Size: 78.2mm, Series: 60 & 50, Engine: DDEC II, Year: 1986-1993. Size: 78.8mm, Series: 60 & 50, Engine: DDEC III, Year: 1994 Size: 80.3mmSeries:60 and 50Engine: DDEC IVYear: 1997-1998 Size: for 81.0mmSeries:60 and 50Engine: DDEC IVYear: 1998-1999 Size: for 81.0mmSeries:60Engine: MarineYear: 2000-2003 Size: 82.1mmSeries: 60See Service Manual Color:Black Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings. Package includes: 5x Gauge Block (78.2mm, 78.8mm, 80.3mm, for 81.0mm, 82.1mm) 1x Knurled Handle