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4.0l as in 08 pacifica
DESCRIPTION SPECIFICATION
Type 60° SOHC V-6 24-Valve
Displacement 4.0L
Firing Order 1-2-3-4-5-6
Compression Ratio 10.2:1
Lead Cylinder #1 Right Bank
Metric...

Wut. They are Chrysler engines. The 4.0 is a stroked 3.5l. The only Chryslers that use a merc engine is the grand Cherokee with the diesel and arguably crossfire but that is a Mercedes to begin with.

I think I have some newer 3.3/3.8 heads here at the shop. Last three of the part # is 183.