4.1 Swap Motors- 307, 350 Olds, 368 Cadillac, Which do you prefer?
Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds / (Old System)

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

CadillacForums.com is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Results 1 to 5 of 5
The Classic Cadillac Forum Discussion, 4.1 Swap Motors- 307, 350 Olds, 368 Cadillac, Which do you prefer? in Past Cadillac Vehicle Discussion; Got my Slantback Seville a few months ago and I absolutely love it! Despite what this thread may suggest, my ...
  1. #1
    SevilleSlantback is offline Cadillac Owners Member
    Automobile(s): '84 Seville Slantback 4.1
    Join Date
    May 2012
    Posts
    3

    4.1 Swap Motors- 307, 350 Olds, 368 Cadillac, Which do you prefer?

    Got my Slantback Seville a few months ago and I absolutely love it! Despite what this thread may suggest, my 4.1 seems to be an adequate engine and it's very healthy for now at 43,000 miles. Sure it's slow, but I'm swapping the cat the first chance I get and later the spark plugs so by no means is the engine going to be swapped out in the near future.

    With that said, I sometimes dream of what the Seville could really haul around with the right engine.With the 4.1's history, I could be looking at replacing the engine at some poin during the car's lifetime, maybe a few years down the road when I can afford a few thousand bucks to do so. (ain't selling it, heh heh). I've heard that engine swaps are popular with these cars, and the longitudal cars arguably have the better lot of engines from which to choose: Caddy Big Blocks and Olds Smallblocks from what I've heard. Ideally the bigblock would be the first choice, but in this era of $4.00 gas that has doubled in price during the span of one presidential term that seems impractical. That leaves us with:

    Olds 307 Rocket: Nice little reliable engine from what I've heard, most economical. Power limited to about 400 due to internal structure.

    Olds 350 Rocket: Bigger cousin to the 307, more power potential but less efficient. How much less?

    Cadillac 368: the infamous "V8-6-4" engine, but actually a very good plant without the electronical stuff. Does it have a market in tuning at all? Don't know much about this one, but it was standard for the Seville in 1981.

    Are there any other engines swappable into a 2nd gen Seville? What about Chevy engines, etc, or even more modern plants like the LT and LS plants? Another question: would a 307 or 350 out of a rear-drive Brougham be compatible with this front-drive car?

    5K25J45M93na3m03L6c251b49fda8ed80193b.jpg

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    talismandave's Avatar
    talismandave is offline Cadillac Owners Master
    Automobile(s): 1987 Brougham, 1974 Fleetwood Talisman, Volvo C70,
    Join Date
    Mar 2012
    Location
    Madison WI
    Age
    55
    Posts
    5,950

    Re: 4.1 Swap Motors- 307, 350 Olds, 368 Cadillac, Which do you prefer?

    Can't help, but welcome, and good job posting pic with post! Do you really think we will settle for one! Looks like a great car. I'm sure someone can help.

  4. #3
    77CDV's Avatar
    77CDV is offline Cadillac Owners Master
    Automobile(s): 77 CDV, 06 DTS III, 69 FWB
    Join Date
    Mar 2006
    Location
    Newbury Park, CA
    Age
    42
    Posts
    9,106

    Re: 4.1 Swap Motors- 307, 350 Olds, 368 Cadillac, Which do you prefer?

    I'd do a 350 and be done with it.

  5. #4
    Big Pip's Avatar
    Big Pip is offline Cadillac Owners Fanatic
    Automobile(s): '72 Coupe DeVille
    Join Date
    May 2008
    Location
    Central FL
    Posts
    104

    Re: 4.1 Swap Motors- 307, 350 Olds, 368 Cadillac, Which do you prefer?

    hands down, Olds 350. Find a set of PRE 1973 heads to bolt on and you will have a nice powerplant.

  6. #5
    cadillac kevin's Avatar
    cadillac kevin is offline Cadillac Owners Master
    Automobile(s): chevy 350 powered 86 FWB, 00 safari h.t. 66 toro, 83 lesabre
    Join Date
    Dec 2010
    Location
    St. Louis, MO
    Posts
    5,606

    Re: 4.1 Swap Motors- 307, 350 Olds, 368 Cadillac, Which do you prefer?

    I'd go for an olds 350. good power and not as thirsty as the 368.
    350 chevy would be my second choice. they make decent power in stock form, but aren't as "refined" as an olds motor.
    third choice would be the 425 cadillac big block (although you'd have to change to a fwd th400 trans)
    since the 82- fwd sevilles use a 200r4, you cant put too much power through it (limit is 330 ft/ lbs IIRC). you can get by with a 350 as long as you don't stomp on it too much.

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.
If you do not want to register, fill this field only and the name will be used as user name for your post.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Bookmarks

Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
Read about Lincoln | Buick | Kia Forte Forum
Need products for your Cadillac? Check out your options at the links below:

custom floor mats | Cadillac Chrome and Black Chrome Wheels | window tinting