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Jason15036

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Both engines have a 10.3:1 compression ratio and direct acting hydraulic tappets. Both have OBDll and both are 300 HP engines. My feeling is that this can be done. If you have a scrap yard near you they are usually pretty good at what engines are compatible with what years, but I am sure someone here will opine on this.

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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One challenge that comes to mind right out of the box would be the engine to cradle mounting arrangement with different part number/design mounts. And I say that because the '98-04 Seville engine (front head) does not use torque struts (dog bones).

At some point, and I think it was '98, the idle speed control became air bypass which replaced the previous mechanical throttle plate control system. The two systems might not be plug compatible and the '97 PCM could become confused about how to control idle speed on a later engine.

Certainly not deal killers.

Jim

Drive your car.

Use your cell phone.

CHOOSE ONE !

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Good Point JimD. How difficult do you think it would be for us to analyze engine swap possibilities and produce a chart (with disclaimer of course :lol:)?

Recently we had a member who had the wrong heads when he replaced his engine (who was that?) and the alternator bolt holes were different. How would something like that create problems year to year, could say alternator/accessory brackets not be compatible?

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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That would be something our old friend could put together in 30 minutes or less!! But not me; I have no hands-on experience prior to 1998.

Now, if you want to talk about flat head Fords, I might have some input.

Jim

Drive your car.

Use your cell phone.

CHOOSE ONE !

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I think this is something that would be useful to us. Bruce what do you think about us pooling our experience as a group and preparing a year to year compatibility chart?

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Seems handy since we do get that question now and then. I have read of swaps that worked that I would have said were not wise, so it can also depend on the installer, and how much mix and match work they do with the engine parts I suppose.

Bruce

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Thanks for the replys guys. On intake sitiuation I could just put the the 97 intake on the 1998 block, and this would hopefully make everything work and I am sure I could make the the dogbones work. My mane question is though is the wiring and pcm are compatiable. I thought the ETC and STS had the same vin motor. Thanks for the great help guys. One more thing how do you access the trouble codes on a 1997 ETC. Not familiar with the 1996 and 1997 styles. A guy is selling a 1997 Eldorado and all he says is he turned into his driveway and the motor popped and went dead. I trying to get some more info from him.

Thanks Jason

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The front head is different between the 97 and 98 years. This I know because my new motor arrived with 97 heads on it and the alternator bracket among other things didn't line up. The builder had to send out a 98 head.

Charles

Charles

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The front head is different between the 97 and 98 years. This I know because my new motor arrived with 97 heads on it and the alternator bracket among other things didn't line up. The builder had to send out a 98 head.

Charles

Thanks Charles, that is what I was thinking about, your plight. If I wasn't so lazy I would have gone back to find that... While it was a PIA for you, we learned that there are bolt patterns differences that are important to know. How is it running?

As a matter of fact Charles, the original poster is talking about a 97 and 98 swap, your info is invaluable and needs to be considered in swaps. Thanks

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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I think what I am going to do is go to my favorite scrap yard and check their computers. I'll bet that if anyone has this figured out, the scrap yards do. They have the ability to determine year-to-year and model to model (Cadillac ~ Olds, Taurus ~ Sable) compatibility. Ill post my findings here, maybe I can get enough info to solve this mystery and that with what we already know and can continue to gather will be helpful in this matter.

I think this will be a good thread to keep building on.

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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The front head is different between the 97 and 98 years. This I know because my new motor arrived with 97 heads on it and the alternator bracket among other things didn't line up. The builder had to send out a 98 head.

Charles

Thanks Charles, that is what I was thinking about, your plight. If I wasn't so lazy I would have gone back to find that... While it was a PIA for you, we learned that there are bolt patterns differences that are important to know. How is it running?

As a matter of fact Charles, the original poster is talking about a 97 and 98 swap, your info is invaluable and needs to be considered in swaps. Thanks

The new motor runs great, Mike. Thanks for asking :)

Charles

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