Dodge 8.0 Differences?

PovertyPony

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I know this topic has been beat to death- but what is the extent of differences between the 8.0 found in the Viper and the 8.0 "Magnum" engine found in Rams? I've been entertaining the idea of the Magnum for another project and wondering how much knowledge would carry over.

Now I know the answer is "they're totally different." They were separate but parallel programs at Dodge both based on the old LA platform. But the question is how different? I know they don't share any parts. But is it like the 5.4 found in the Cobra R or GT compared to the 5.4 found in F150s, where they don't share any parts but they're the same platform, or is it more like the 351 Cleveland compared to the 351 Windsor, where they have absolutely nothing in common but the same displacement? (Ignoring Cleve-or hybrids.)

In particular I wonder about the valvetrain and rotating assembly, since the truck versions seem to leave a lot on the table with those.
 

MoparMap

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I had thought they said the only real similarity between the two was bore spacing or something like that. I think there were only a half dozen part numbers or so that were common between them. That being said, since the 8.0 was based on the LA, I'd wonder if it wouldn't share more in common with the Magnums when it comes to parts. One other thing with the Viper, it might not share actual part numbers with earlier engines, but sometimes those parts do interchange. One example I can think of is the lifters. The Viper lifters are a different part number than the LA lifters, but in theory they are the same parts dimensionally. I believe the Viper ones are held to a much better tolerance though, which could be one reason they have a different number. So Viper lifters could be used in other engines, but other lifters may or may not work in the Viper based on how well they were made.

Generally speaking though, changing from iron to aluminum is going to affect a whole lot of design parameters. Different thermal expansion and strengths are likely going to dictate different structural designs and interacting components.
 
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PovertyPony

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That's exactly what I'm driving at. I've seen guys use rockers, pushrods, and other valvetrain parts from the Viper engine in the truck one- both basically LA based stuff. And same thing with the other engines I mentioned: the GT lash adjusters and followers were different than the run of the mill truck parts, but they fit in place and were a popular upgrade. Same deal with both the Ford Modular and GM LS engines with iron vs. aluminum. Totally different parts, but same families so you could mix and match. Not to mention all the purpose built parts that would be different between a truck and sports car engine, even if they're interchangeable. It would be no surprise the rods are heavier for the lower RPM, higher volume truck versus the higher revving, higher cost Viper, but are they compatible?
 

Viperhunter

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Apparently Hall of Famer **** Winkles who helped develop the V-10 is suppose to be at this event in Pittsburgh. Might be pretty close to you. Could probably get some one-on-one time with him and hear it from thee man.

 
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