: 76 Calais vs 81 DeVille

06-10-03, 10:44 PM
We have recently picked up a 76 Calais as a hobby car. Having a blast so far, but finding the replacement part are costing more than the original car.

We have the opportunity to buy an 81 Sedan DeVille for spare parts. The question is..."how many are interchangable".

Does anyone have any idea on the overlap. We particularly need an exhuast manifold, tie rods, stablizer bars...at this point.

Thanks in advance for your advice.

06-11-03, 06:50 AM
76 Calais had 500cid engine, 81 DeVille 4,1 litre (by Buick) or Cadillacs own 368cid engines (i think, there was Olds 350 diesel too in this year).
So exhaust mainfolds can not be replaced

06-11-03, 07:15 AM
Unfortunately, there's not much that will swap out between the two cars. RWD Cadillac front-end parts were grouped '71-'76 and then '77-'84. The engines were also different as mentioned by vanaisa although the '81 Deville used a "Cadillac" 4.1 not a "Buick" 4.1

06-11-03, 07:22 AM
Thank you for your advice guys.

06-13-03, 10:28 AM
1981 was the year for the 8-6-4. I think it was a 368 ci. engine. You can disable the 8-6-4 without too much trouble. The 368 was (I think) a variation of the 425.

06-13-03, 10:32 AM
Thanks Elvis...and nice side burns :)

Night Wolf
06-13-03, 02:55 PM
question on the V8-6-4....... it is kinda like the displacement on demand thing....what was the bad thing about it, and why did it fail soo much?

And I think I heard too that the 368 is the smae as a 425 (destroked?)

06-13-03, 11:21 PM
Basically, the idea was too advanced for the technology at the time!!

06-15-03, 06:45 PM
Yeah, I think Wes is right. It was a computer problem that caused a bunch of things to get out of synch and the engines ran really rough for a time, then would do damage to themselves. The "fix" was to disable 8-6-4 and just run in 8-cyl mode all the time. The engines are good engines.

Dad had a Coupe de Ville with 8-6-4, which he loaned to me for a few months while I was between cars. We never had a minute's trouble with it, and I think we put on about 40,000 miles. Most of the problems I heard of happened within the first 20,000 miles, so there were some good ones out there.