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 ...
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?
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.