[Duane Hayes]

Without me going through all the posts here, wondering if the 4.9 is a direct bolt in to replace a 4.1 in a 1985. I realize that the computer and engine controls are probably somewhat different. But I would just use all the 4100 controls and computer, and perhaps the computer wouldn't know the difference in the increased displacement. I didn't see a search option here on the site to search this question, maybe I missed this. Duane

 

[BigCadMan_1]

This thread will give you all the info you will need to use a 4.9 block in the 4.1 application.

http://www.cadillacforums.com/forums/ht4100-4-1-4-5-4/267210-1987-deville-4-1-4-9-a.html

 

[carnut]

On a 85 Seville the engine faces forward and the trans sits beside it unlike a newer front wheel drive engine where the engine is sideways. A 4.9 will not bolt up to your transmission number one and the engine block casting wont allow a proper engine driven fan. a 85 DeVille can be adapted to a 4.9 as you've seen in the above posters link.

 

[Duane Hayes]

Thanks so much, that's information I didn't know about, appreciate your help for sure! Duane

 

[caddeville]

Make the transmission fit....Use electric cooling fan..or two small ones...