6.6 CHEVY GM STREET SERIES SPEED OF AIR LONG BLOCK CALLIES CRANKSHAFT (STD AUTO) 07.5-10 LMM TOPKICK Core Charge Applies plus Core Container Charge (3000) of 500 Crate charge

If your 2007.5 to 2010 Duramax-powered 2500HD, 3500HD, or TopKick is down on power or reliability, this Street Series Long Block from DFC Diesel is the kind of upgrade that takes your build from worn out to worry-free. It’s more than just a replacement, it’s a smarter, stronger foundation built with durability in mind. One of the key highlights is the forged Callies crankshaft, a high-strength component trusted in serious performance applications. This crank holds up under heavy torque and abuse, making it a perfect match for trucks that see real work or long-distance hauling. DFC didn’t stop there though. You’re also getting ARP or OptiTorque head studs, Total Seal gapless piston rings, and a fully remanufactured top end to handle the daily grind. It’s built for guys who depend on their truck every day and need it to start strong, run clean, and last. And with a 5-year, 160,000-kilometer warranty behind it, this long block gives you confidence from the first turn of the key.

The DFC Diesel SS6607510LMMSOALB Street Series Long Block is carefully engineered for trucks running the 6.6L Duramax LMM engine from 2007.5 to 2010, including GM 2500HD, 3500HD, and TopKick models. It begins with a professionally machined block, bored to fit next oversized pistons, ensuring clean tolerances and better long-term sealing. Inside, you'll find all new OEM-equivalent pistons, rings, bearings, and gaskets that exceed factory specifications. The forged Callies crankshaft delivers superior strength and durability, especially under high load or high mileage conditions. Cylinder heads are resurfaced, magnafluxed, and rebuilt with new guides, valves, and stem seals to support clean combustion and reduce oil consumption. DFC also includes a full top-end gasket kit and pre-set valvetrain components to speed up installation and ensure consistent performance. Their advanced Rottler machining process, along with upgrades like a Woodruff keyed camshaft and custom doweled oil pump gear, helps eliminate common failure points. The result is a long block that’s reliable, rebuild-strong, and ready for real-world use.