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Discussion Starter #1
hi guys i have 2001 cadillac deville limo headgasket blow.can i fit a engine of a 2001 seville sts ?
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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hi guys i have 2001 cadillac deville limo headgasket blow.can i fit a engine of a 2001 seville sts ?
=========================
you can use any Northstar motor from 2000 through 2003 - Deville - Seville - Eldorado -
HOWEVER -
there are TWO different engine codes -
Y = 275hp -
9 = 300hp -

the ONLY physical difference between the two is the INTAKE CAM -

IF your Deville has the CODE Y motor - and you install a CODE 9 motor -
YES - it WILL run OK -
NO - you will NOT get ANY more power - in fact - you MIGHT loose a little gas mileage -

with that said -
you are taking a BIG chance that the replacement motor
MIGHT also develop head gasket problems - or oil leaks - which are equally expensive to fix -

unless the original motor has a LOT of miles on it -
you would be better off getting the head gaskets fixed and the engine completely resealed -
I had this done on my 2003 DHS for around $2500 -
 

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Discussion Starter #3
=========================
you can use any Northstar motor from 2000 through 2003 - Deville - Seville - Eldorado -
HOWEVER -
there are TWO different engine codes -
Y = 275hp -
9 = 300hp -

the ONLY physical difference between the two is the INTAKE CAM -

IF your Deville has the CODE Y motor - and you install a CODE 9 motor -
YES - it WILL run OK -
NO - you will NOT get ANY more power - in fact - you MIGHT loose a little gas mileage -

with that said -
you are taking a BIG chance that the replacement motor
MIGHT also develop head gasket problems - or oil leaks - which are equally expensive to fix -

unless the original motor has a LOT of miles on it -
you would be better off getting the head gaskets fixed and the engine completely resealed -
I had this done on my 2003 DHS for around $2500 -
ok thank you very much
 

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Registered
Joined
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Discussion Starter #4
=========================
you can use any Northstar motor from 2000 through 2003 - Deville - Seville - Eldorado -
HOWEVER -
there are TWO different engine codes -
Y = 275hp -
9 = 300hp -

the ONLY physical difference between the two is the INTAKE CAM -

IF your Deville has the CODE Y motor - and you install a CODE 9 motor -
YES - it WILL run OK -
NO - you will NOT get ANY more power - in fact - you MIGHT loose a little gas mileage -

with that said -
you are taking a BIG chance that the replacement motor
MIGHT also develop head gasket problems - or oil leaks - which are equally expensive to fix -

unless the original motor has a LOT of miles on it -
you would be better off getting the head gaskets fixed and the engine completely resealed -
I had this done on my 2003 DHS for around $2500 -
i am getting the seville engine very cheap only for £300 i am in the uk its very hard to get parts here for these cars. my deville limo is 275hp and the engine of the sts is 300hp do i need to reprogram the ecu? can i use the engine and the transmission of the sts on my deville ?
 

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2001 eldorado,2008 DTS,2005 XLR, '96 eldo,'95 eldo,' 89 eldo,'78 eldo,'11CTS-V
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Yes the tranny will swap, but the final ratios are different.
The PCM will notice this and set a code. No biggie.
No, the PCM doesn't need to be reset.
 

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Discussion Starter #6
Yes the tranny will swap, but the final ratios are different.
The PCM will notice this and set a code. No biggie.
No, the PCM doesn't need to be reset.
thanks you very much. so i can just swap the engine and the trans ? or only the engine?
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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19,292 Posts
i am getting the seville engine very cheap only for £300 i am in the uk its very hard to get parts here for these cars. my deville limo is 275hp and the engine of the sts is 300hp do i need to reprogram the ecu? can i use the engine and the transmission of the sts on my deville ?
====================
you CAN NOT reprogram the PCM -
and you can NOT use the STS PCM in the Deville -

the final drive ratio IS different -
the Deville is 3.11:1 and the STS is 3.77:1

using the STS trans in the Deville WILL cause some issues -
including constantly setting DTC's Diagnostic Trouble Codes -
and illuminating the SES light -
BUT - YES - it will function -
 

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Discussion Starter #8
====================
you CAN NOT reprogram the PCM -
and you can NOT use the STS PCM in the Deville -

the final drive ratio IS different -
the Deville is 3.11:1 and the STS is 3.77:1

using the STS trans in the Deville WILL cause some issues -
including constantly setting DTC's Diagnostic Trouble Codes -
and illuminating the SES light -
BUT - YES - it will function -
thanks for your help.
what is the best to do can i only swap the engine and use the deville trans ?
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
Joined
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19,292 Posts
thanks for your help.
what is the best to do can i only swap the engine and use the deville trans ?
==================
YES - keeping the Deville trans will eliminate several issues -
 

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Registered
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=========================
you can use any Northstar motor from 2000 through 2003 - Deville - Seville - Eldorado -
HOWEVER -
there are TWO different engine codes -
Y = 275hp -
9 = 300hp -

the ONLY physical difference between the two is the INTAKE CAM -

IF your Deville has the CODE Y motor - and you install a CODE 9 motor -
YES - it WILL run OK -
NO - you will NOT get ANY more power - in fact - you MIGHT loose a little gas mileage -

with that said -
you are taking a BIG chance that the replacement motor
MIGHT also develop head gasket problems - or oil leaks - which are equally expensive to fix -

unless the original motor has a LOT of miles on it -
you would be better off getting the head gaskets fixed and the engine completely resealed -
I had this done on my 2003 DHS for around $2500 -
Please hook me up to your mechanic.... I talked to 5 mechanics here in Wisconsin Dells/Madison area... 2 won’t even touch it and the other 3 quoted $4500-5,000 for head gasket replacement and drilling the bolt holes or whatever else they do.
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
Joined
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19,292 Posts
Please hook me up to your mechanic.... I talked to 5 mechanics here in Wisconsin Dells/Madison area... 2 won’t even touch it and the other 3 quoted $4500-5,000 for head gasket replacement and drilling the bolt holes or whatever else they do.
=========================
that would be Joe Blau at Midwest Cadillac Repair in Palatine Illinois - 847-776-1234 -
that's only a couple hour drive from Madison -

Joe has done HUNDREDS - could be over a THOUSAND by now -
when you call - tell him you are a member of the Cadillac Forums -
and Basscatt referred you - you'll get a discount -

he does them the RIGHT WAY!

he uses the big - NS300L - "Norms" inserts - NOT the crappy little "timeserts"
he also includes resealing the lower half-case and the oil pan -
I had him replace BOTH front and rear main seals and the oil pressure switch -
AND had him replace the transmission solenoids as a preventative measure -

the entire job was less than $2500 - "out-the-door" -
 

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=========================
that would be Joe Blau at Midwest Cadillac Repair in Palatine Illinois - 847-776-1234 -
that's only a couple hour drive from Madison -

Joe has done HUNDREDS - could be over a THOUSAND by now -
when you call - tell him you are a member of the Cadillac Forums -
and Basscatt referred you - you'll get a discount -

he does them the RIGHT WAY!

he uses the big - NS300L - "Norms" inserts - NOT the crappy little "timeserts"
he also includes resealing the lower half-case and the oil pan -
I had him replace BOTH front and rear main seals and the oil pressure switch -
AND had him replace the transmission solenoids as a preventative measure -

the entire job was less than $2500 - "out-the-door" -
THANK YOU!! I will get hold of him when things go back to normal.
 
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