GM 6.5L V8 – Cylinder Case Features

The one-piece cylinder case is made from cast iron and has the following features (refer to Figures 2-2 and 2-3):
• Support for the crankshaft
• Support for the camshaft and hydraulic lifters
• Cylinder bores for the piston/connecting rod assemblies
• Mounting surfaces for cylinder heads
• Mounting surfaces for the front cover and oil pan
• Lubrication and cooling system passages
• Surfaces for powertrain mounts

Service of the cylinder case includes the following repairs:
• No machining of these surfaces:
– Crankshaft bearing bores
– Camshaft bearing bores
– Hydraulic lifter bores
– Cylinder head decks
• Machining of the cylinder bores to accommodate 0.50mm (0.020-in.) oversize service pistons

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