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99 engine in 97 grand marquis.

Old 08-09-2009, 02:50 PM
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Join Date: Aug 2009
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Default 99 engine in 97 grand marquis.

Hello. New to the forum and grand marquis ownership. I have a question. I have a blown engine in a 97 grand marquis gs and a smashed 99 with 500 miles. I would like to put the two togther. I was wonderning what i will need to change over? Is the harness the same. Do i need to change the manifold. I have the new tranny too and will most likely change that out because the 97 has over a hundred thousand . Is there any one that knows this please post or pm. Thank you and I will happily enjoy my big car in the era of the tiny one.
Old 08-09-2009, 04:57 PM
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Join Date: Oct 2008
Location: United States
Posts: 1,361

I'm not sure about the harnesses, but you could swap out the engines and just reconnect everything electrically and swap the engine control computers and it should work. I think there's a few bolt pattern changes for the heads and intake (if I remember correctly) from 97 to 98, but the rest I think is the same. If I'm mistaken, someone else will be along to correct me.
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