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Mopar
Dodge Dakota
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12/02/2005
22:12:39
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 Subject: Longevity
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As it has been talked about before, the 3.9/5.2 is notorious for the amount of abuse they can take. My question is what makes this motors capable of lasting so long? Which would last longer a Poly, LA, or Magnum style?
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six banger
Dodge Dakota
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12/03/2005
07:02:03
| RE: Longevity
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I think having cast iron heads and block help a lot. No issues with head gaskets blowing because of different rates of expansion.
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Kowalski
GenIII
12/03/2005
08:37:50
| RE: Longevity
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That doesn't hurt, but many engines are made of cast iron. Also contributing are a couple of engineering features. These motors are a long rod design - that means less wear to cylinder bores from the forces of piston side thrust as the crank goes through its rotation. Mopar also favors the widest lifters of any of the big three. Before roller rockers, this played a role in the longevity of the cam. The older Chevys, with the narrowest lifters, had a reputation for wiping the cam lobes.
Lead, follow, or get out of the way
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Mopar
Dodge Dakota
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12/03/2005
13:23:38
| RE: Longevity
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Which would last longer a Poly, LA, or Magnum style?
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gen1dak
Dodge Dakota
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12/03/2005
15:05:46
| RE: Longevity
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The Poly has much greater over-bore capability. Otherwise, they're pretty much the same. Early LA's and the Poly had lighter rods, but even they are pretty stout, especially when you compare them to the Chevy "pink" performance rods.
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