Reliance Customizable Long Blocks for Cummins 3.9L, 5.9L and 8.3L B & C Series Engines are available in two valves per cylinder head version, with individual valve covers for each cylinder. Each of these long blocks is completely new and built from the bare block up using Reliance parts to create a long block specific to the user's application. Reliance long block assemblies access the user to high-quality parts and Reliance's extensive product knowledge.

The Engine Long Blocks contain new crankshaft and seals, connecting rods, pistons with rings, cylinder head, oil pump, water pump, front cover and housing, gaskets, oil cooler and oil filter adapter, valve covers and oil pan.

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