Engine Components
EXHAUST MANIFOLDThe exhaust manifolds are constructed of cast iron and are LOG type with balanced flow.
INTAKE MANIFOLD
The aluminum intake manifold is a single plane design with equal length runners. The manifold is sealed by flange side gaskets with front and rear cross-over gaskets.
CYLINDER HEAD
Cylinder Head Assembly:
The alloy cast iron cylinder heads are held in place by 10 bolts. The spark plugs are located in the peak of the wedge between the valves.
The 5.2L cylinder head is identified by the foundry mark NH.
PISTONS
All pistons are machined to the same weight, regardless of size, to maintain piston balance.
The pistons are elliptically turned so that the diameter at the pin boss is less than its diameter across the thrust face. This allows for expansion under normal operating conditions. Under operating temperatures, expansion forces the pin bosses away from each other, causing the piston to assume a more nearly round shape.
The piston pin rotates in the piston only and is retained by the press interference fit of the piston pin in the connecting rod.