'90 SE motor for '87 LE? HELP! - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-23-2010, 01:49 PM   #1
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Default '90 SE motor for '87 LE? HELP!

Hey guys, it'* been a while, my 87 Bonnie has been down for 2 months with failed reverse reaction drum, but need to know if I can drop a 90 SE motor straight in or if there are any big details which may have to be addressed. I have access to the entire SE car, computers etc, and I am under the impression the new motor/trans is still fairly good, but have not yet decided to raid the tranny, or keep it together for a fast job. I have yet to do compression test, etc. and plan on doing it today, any help is greatly appreciated. Thanx for takin the time.......

Last edited by backhoe; 04-23-2010 at 02:00 PM. Reason: adding info
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Old 04-25-2010, 11:56 PM   #2
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Show be a simple motor swap. Both motors are the non series 3800. and same body styles.
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Old 04-29-2010, 06:09 AM   #3
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Default Possible issues

I'm a little wary of electrical issues, hopefully the ths '90 SE motor has the same plugs, otherwisise I guess i will have to fudge some conections. The '90 has the steering wheel pod controls, but i dont think it will have any bearing on enginne parameters since the EMC comp is separate. If I am wromg please let me know. Props!! Peas out!!!
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Old 04-29-2010, 06:57 AM   #4
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Show be a simple motor swap. Both motors are the non series 3800. and same body styles.
IIRC they are two different motors though. Isn't one the C motor and the other the L motor?
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Old 05-22-2010, 09:35 PM   #5
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IIRC, the '87 is a "3" motor and the '90 is a C. I've worked on both when our family owned cars with these engines but darned if I can remember much about the 3 motor... still have the car with the C.
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