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I bought a 89 civic sedan that already has a b18b1 swapped into it. I've been wanting to swap a different engine into the car because I'm sure the current one has bad rings, I've been thinking about doing a gsr swap, would it be simple? Would the mounts be the same? Would I have to change the harness? I've already decided to get a hondata and get it tuned so ecu isn't a issue. This is also my first time posting on a thread so I'm looking for as much input as possible.

 
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Never done it myself but you have a b series and you're putting in another b series so I don't believe you'd have to change mounts, harness may be different but it might not be

 
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Harnesses are different (GSR has VTEC, LS doesn't). The mounts that you have will work.

Now's the perfect time to do LS/VTEC.

 
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I would go ls/vtec but I'm worried that my piston rings are bad and I don't have the time or place to rebuild it. Would I just have to swap the harness if I went gsr?

 
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Well, LS/VTEC basically requires a new bottom end, so I guess that’s out of the question.

I’m pretty sure you only need to swap the harness. I’d try to find a trans too because the gearing is a lot sportier from a GSR trans, but you’d be fine with the one you have now.

Also, what makes you think that it's a piston ring issue?