The Carrillo 6.6L Duramax LML Pro-H Connecting Rod is a must have in your 2011-2012 GM 6.6L Duramax engine build.Â Since 1963, Carrillo is recognized as the preeminent custom connecting rod manufacturer in the world. Carrillo has provided custom and prototype connecting rods to virtually every major automotive and motorcycle venue, most notably to the high performance and speed equipment industry. Â Carrillo uses proprietary chrome, nickel, moly, vanadium alloy which meets all VAR (vacuum arc re-melt ASTM standards). The heat is validated, both by the supplier and an independent metallurgist whom confirm the desired physical and chemical properties of steel. Â All heat treat processes are via a mar-aged operation, resulting in UTS of 195,000 with a yield of 182,000 while maintaining the critical elements of low notch-sensitivity and ductility. Â All Carrillo connecting rods are manufactured from an oversized forging resulting in the proper grainflow as well as the surface removal of any potential inclusions or surface conversions generated by the forging process. All critical CNC machines at Carrillo are equipped with probing to accurately validate dimensional integrity. In the production process each part is magnafluxed at least twice, further each piece is Rockwell tested to validate the heat treat procedure. A final shotpeen operation completes the part. This connecting rod comes with H-11 bolts and is for use in a wide range of applications.Â Features: Pro-H DesignÂ H-11 Tool Steel BoltsÂ Sold IndividuallyÂ Product Specifications: Product Number: GM_BDM66_2HS_6418B7H CC: (6.418 in.) (163.02 mm) Style: Pro-H Bolt Size: 7/16" Bolt Type: WMCÂ PE Width: (1.261 Tapered in.) (32.03 mm) BE Width: (1.119 in.) (28.42 mm)Â BE Bore: (2.6372 in.) (66.985 mm) Pin Size: 1.359 Total/Rotate/Recip (GR*): 1063/677/386 H-11 Tool Steel Bolts (220,000 UTS) *Weights and dimensions are for reference only. Actual weight may vary. All sets match to +/- 1 gram per end.