Description And Operation: Engine: Notes

The 3.9L and 4.2L engines have:

• a V-block with six cylinders and splayed crankpins.
• a distributorless ignition system.
• a multiport, sequential fuel injection (SFI) system.
• a variable length induction system (intake manifold runner control).
• overhead valves.
• hydraulic valve tappets for automatic lash adjustment.
• connecting rod parting faces that are unique with an interference fit.
• an engine dynamic balance shaft.