Chevrolet Performance 6.6L 400 C.I.D. Diesel Remanufactured Long Block Crate Engines 97779462

Heavy-duty trucks and towing rigs are the target for this remanufactured 6.6L Duramax diesel long block (part 97779462), a 400 cubic inch engine combining a cast-iron block with aluminum cylinder heads as a factory-spec replacement rather than a performance upgrade.

What remanufactured means for this engine

The process restores factory-spec internals, and the long block arrives with the intake manifold and fuel injection system, oil pan, timing cover, and valve covers installed, plus the water pump and harmonic balancer already fitted. Several items still need to travel over from your old engine or be bought separately: the ECU, the turbocharger, fuel injectors, an exhaust manifold, and a wiring harness are not part of this package. The rotating assembly is internally balanced, and the rear main seal uses a single-piece design.

Where it belongs

This is a direct replacement for GM trucks originally equipped with the 6.6L Duramax engine, built for towing duty, fleet service, and hard work rather than light commuting, and it pairs with OEM and aftermarket Duramax performance parts alike. It runs on ultra-low-sulfur diesel and needs a compatible fuel injection system to operate.

Before you order

Does it include a turbocharger? No, reuse your existing one or source a replacement separately. Is professional installation recommended? Yes, given the complexity of integrating the ECU and fuel system with a work truck's wiring and emissions equipment. What about coverage? Terms depend on the supplier you buy from, so confirm the specifics before you order. Is this a performance upgrade? No, it is built to restore factory towing and hauling capability rather than to add power beyond the original Duramax rating.

Specifications