{"product_id":"dfc-diesel-kore660104lb7lbcc-kore-series-calles-crankshaft-long-block-std-auto-2001-2004-gm-sierra-silverado-2500hd-3500hd-6-6l-duramax-lb7","title":"DFC Diesel KORE660104LB7LBCC Kore Series Calles Crankshaft Long Block (STD\/Auto) | 2001-2004 GM Sierra\/Silverado 2500HD\/3500HD 6.6L Duramax LB7","description":"\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eUpgraded Callies aftermarket crankshaft included\u003c\/li\u003e\n\u003cli\u003eStronger than factory Duramax crankshaft\u003c\/li\u003e\n\u003cli\u003eTotal Seal gapless piston rings included\u003c\/li\u003e\n\u003cli\u003eFor use with automatic and manual transmission\u003c\/li\u003e\n\u003cli\u003eProfessionally machined using Rottler equipment\u003c\/li\u003e\n\u003cli\u003eTighter tolerances than OEM specifications\u003c\/li\u003e\n\u003cli\u003eAll new pistons, rings, bearings, and gaskets\u003c\/li\u003e\n\u003cli\u003eImproved gasket sealing in common leak areas\u003c\/li\u003e\n\u003cli\u003eBuilt in ISO 9001:2015 certified facility\u003c\/li\u003e\n\u003cli\u003e1 year unlimited mileage warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eAddressing The Duramax's Most Catastrophic Failure Point\u003c\/h4\u003e\n\u003cp\u003eAsk any Duramax owner about the scariest failure on this platform, and a broken factory crankshaft usually tops the list. The DFC Diesel KORE Series Callies Crankshaft Long Block was built specifically to take that risk off the table, pairing DFC's remanufacturing process with an upgraded Callies aftermarket crankshaft in place of the factory unit. Callies has built a real reputation in the diesel performance world for crankshafts that hold up where the stock LB7 crank simply wasn't designed to, especially under sustained load or increased power. This long block gives 2001-2004 GM Silverado and Sierra 2500HD and 3500HD owners a genuine strength upgrade at the bottom end, not just a standard remanufactured replacement. Alongside the Callies crank, you're still getting everything the standard KORE Series long block delivers, including Rottler machined tolerances tighter than OEM, Total Seal gapless piston rings, and improved gasket sealing in this platform's known leak points. Whether you're rebuilding after a close call or building proactively before your LB7 ever lets you down, this long block gives you real peace of mind at the one failure point that worries Duramax owners most.\u003c\/p\u003e\n\u003ch4\u003eCallies Crankshaft Strength Built Into A Precision Remanufactured Long Block\u003c\/h4\u003e\n\u003cp\u003eThe DFC Diesel KORE660104LB7LBCC is a remanufactured long block engineered specifically for 2001-2004 GM Silverado and Sierra 2500HD and 3500HD trucks equipped with the 6.6L Duramax LB7 engine, built around an upgraded Callies aftermarket crankshaft in place of the factory unit. This crankshaft upgrade directly addresses one of the LB7's most well known failure points, where the factory crank can break under sustained high horsepower or heavy load. Beyond the crankshaft, this long block follows the same remanufacturing process as DFC's standard KORE Series builds, machined using Rottler equipment for tolerances that exceed OEM specifications. The engine includes all new pistons, rings, bearings, gaskets, seals, valves, springs, hardened seats, stem seals, and cast guides, along with Total Seal gapless piston rings and improved gasket sealing methods in common leak areas. The long block ships as a complete short block assembly with the cylinder heads included, along with a complete top end gasket kit and silicone to finish the installation. As with DFC's standard long block, this unit does not include the front cover, rear cover, oil pump, upper or lower oil pan, oil pickup tube, rocker arms, pushrods, or valve bridges. Every engine is manufactured in an ISO 9001:2015 certified facility and backed by a 1 year, unlimited mileage manufacturer warranty.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFitment:\u003c\/strong\u003e 2001, 2002, 2003, 2004 GM Silverado\/Sierra 2500HD\/3500HD 6.6L Duramax LB7\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNotes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBuilt with an upgraded Callies aftermarket crankshaft, not the factory unit\u003c\/li\u003e\n\u003cli\u003eDoes not include front cover, rear cover, oil pump, upper or lower oil pan, oil pickup tube, rocker arms, pushrods, or valve bridges\u003c\/li\u003e\n\u003cli\u003eComponent brands may vary by build based on parts availability, cannot be specially requested\u003c\/li\u003e\n\u003cli\u003e$500 shipping charge\/$2,800 core charge \u003c\/li\u003e\n\u003cli\u003eEngine shipping crate must be returned with core engine for full core credit\u003c\/li\u003e\n\u003cli\u003eManufacturer warranty: 1 year, unlimited mileage\u003c\/li\u003e\n\u003cli\u003eOil cooler replacement highly recommended, mandatory if prior engine had a bearing failure\u003c\/li\u003e\n\u003cli\u003eInjector replacement highly recommended on higher mileage or contaminated fuel engines\u003c\/li\u003e\n\u003cli\u003eTurbocharger replacement recommended over 125K miles, mandatory if shaft play present or engine was dusted\u003c\/li\u003e\n\u003cli\u003eWater pump replacement highly recommended if engine has over 125K miles\u003c\/li\u003e\n\u003cli\u003eEvans Waterless Coolant recommended upgrade for corrosion and boilover prevention\u003c\/li\u003e\n\u003cli\u003eThis product cannot be shipped to California\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"DFC Diesel","offers":[{"title":"Default Title","offer_id":54624083149084,"sku":"DDUKORE660104LB7LBCC","price":8842.66,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0738\/2279\/8108\/files\/66-Front_web_600x600_b0b7aabb-561f-4360-963a-b8326c62328c.webp?v=1790719842","url":"https:\/\/www.alligatorperformance.com\/products\/dfc-diesel-kore660104lb7lbcc-kore-series-calles-crankshaft-long-block-std-auto-2001-2004-gm-sierra-silverado-2500hd-3500hd-6-6l-duramax-lb7","provider":"Alligator Performance","version":"1.0","type":"link"}