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General Forums => The Mess Hall => Topic started by: sbeltinc on September 12, 2006, 09:16:21 AM
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I have a 99 TJ (2.5) with a bad short block, will a short block from a 85 CJ (2.5) interchange?. Have found one locally for cheap.
I'd keep my MPFI head and all accessories so basically I'm wondering if changes where made to the block to prevent a direct swap into my TJ?
I understand the CJ fuel pump was mechanical whereas my TJ is electric, not sure if this is a problem.
Thks
Scott
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I believe it should work as long as you're using the block only. You might have to fab up a cover plate for the fuel pump. Although, I can't see how a YJ/XJ/MJ or even a TJ block couldn't be found. The CJ block will no doudt have many miles on it. Probably rust too if it's been sitting.
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Thks, considering the CJ shortblock since it's cheap and I'm only looking to make the rig mobile for a few months while gathering the necessary bits for a more adventurous swap.
Anyone else have experience with the differences between the 2.5 blocks?
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Well from all I've read the blocks should be the same. I know over the years (84-02) some external stuff was shifted around and changed but the block itself should be the same I'd say. Only problem I could see would be like bolt patterns for the exhaust manifold or something else eternal like that.
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All the ports and studs should line up but like I said, I'd probably get a newer core. Rust, broken thread holes and just general age could mean the block is toast and would need a bore job.