Year over year 5.7 engine differences?

[hal9000]

I'm sure this is common knowledge to some, but not me... Aside from intake manifold, what are the differences between the 3rd and 4th gen 5.7 hemi?

Reason I ask, I eventually need to deal with the failing lifter in my 4th gen. There are a handful of running or build able 3rd gen 5.7's available for not very much, but 4th gens are rare and much more pricey. If the engines are internally identical or only have slight component differences, maybe it would make sense to rebuild one to 4th gen specs then just swap motors....

Thanks all.

 

[crash68]

The tone rings on the crank and cams used for timing are different.

 

[Wild one]

I'm sure this is common knowledge to some, but not me... Aside from intake manifold, what are the differences between the 3rd and 4th gen 5.7 hemi?

Reason I ask, I eventually need to deal with the failing lifter in my 4th gen. There are a handful of running or build able 3rd gen 5.7's available for not very much, but 4th gens are rare and much more pricey. If the engines are internally identical or only have slight component differences, maybe it would make sense to rebuild one to 4th gen specs then just swap motors....

Thanks all.

I don't think the 3rd Gen 5.7's have the internal oil passages in the block for the VVT.

 

[hal9000]

Ok, thanks for the info guys. That's what I needed to know. Not a big complication, but it does close off one option for a cheap R&R. But I learned something which is always nice

 

[seabrook]

the heads are different

 

[Tim7139]

First few years the third gen had issues had issues with intake and valve springs. All are prone to issues with valve seats, but you get some high milers.

The 4th gen saw a new block with higher target compression, changes to valve springs, stronger crankshaft with a different profile, active intake, and a few others. This video covers a bunch with side by side comparisons https://www.youtube.com/watch?v=vhXOjR8qqhQ