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Thread: 4.0l v6 ?

  1. #16
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    Quote Originally Posted by DB3NTS View Post
    In theory, could you swap the 4.0 shortblock with the 3.5 shortblock, sounds cool but i wouldnt want to lose my ported heads, cams and intake
    The 4.0L block is almost completely identical to the 3.5L block. The only significant change is that the 4.0L block has larger diameter main bearings than the 3.5L.

    The 4.0L cylinder head castings are identical to the 3.5L cylinder head castings. The 4.0L camshafts have more duration than the 3.5L camshafts, and I think they have a slightly higher lift, but they're otherwise a bolt-in part.

    Your ported heads and ground cams and ported intake should bolt onto the 4.0L block just fine.

    2005 Dodge Magnum SXT - 3.5L HO V6 - NSG370
    Likes tf34mech liked this post

  2. #17
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    Got a new oil cooler, a bunch of different bolts, and my lower intake manifold today! With luck, I will be doing some more work on my 4 liter block this weekend. I might even port-match the lower intake manifold to the heads...

  3. #18
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    Mar 2012
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    Here's the link to the thread for putting the 4.0 Liter crank in a 3.5 block. I think the 4.0 crank is nodular iron so if you're thinking of adding forced induction down the road keep the boost relatively low.

    3.5L Stroker
    Last edited by tf34mech; 02-09-2018 at 05:21 PM.

  4. #19
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    Quote Originally Posted by tf34mech View Post
    Here's the link to the thread for putting the 4.0 Liter crank in a 3.5 block. I think the 4.0 crank is nodular iron so if your thinking of adding forced induction down the road keep the boost relatively low.

    3.5L Stroker
    I am not going this route. This information, about grinding down a 4 liter crank to fit a 3.5 block, is interesting in it's way, but it is ultimately irrelevant to my purpose.

    The idea here is to show that any LX owner looking to replace their 2.7L or 3.5L, can fairly easily swap in a 4 liter V6 out of a Chrysler Pacifica or a Dodge Nitro. The work required to swap in this 4 liter block is only slightly more that the work that would already be required to swap in a replacement 3.5L engine. All that is really needed is the 4 liter short block, some gaskets from Rock Auto, and possibly a few parts off eBay (which would mainly be for the 2.7 folks).

    The LX 3.5L oil pan bolts right up. The LX 3.5L motor mount brackets bolt right up. The LX 3.5L inner timing belt cover bolts right up. I am going to prove this weekend that the LX 3.5L lower intake manifold will bolt right up. My 3.8L manual transmission dust shield holes match the bellhousing bolt pattern on the 4 liter block as they do on the LX 3.5L motor, so I know an LX 3.5L transmission will bolt right up.

    The only question I have left is whether the LX 3.5L crank pulley will fit, and I am reasonably certain it will.



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