81 would have been the 368 engine. I would assume it would be the DEFI 8-6-4 like the rest of the cars but i suppose it could have been a 4bbl. Either way they are not much for power. Good thing is they were based on the 68-79 472/500/425 so the are a solid good old cast iron block so they dont tend to have the problems that the 4100's did. If you are not looking to keep it show quality stock (and maybe emissions testing issues) swapping in one of the older motors is fairly easy. I like other things about the newer cars like disc brakes. I would guess overall there are going to be more parts around for the 81 because they shared more things with other GM lines by that time not to mention that that basic body style lasted till 93 in the Broughams.
Here's a 69 Transam. No Tokyo lightshow on the hood. No comparison. OK! Back to Caddys now.
Hi George,Getting back to Cadillac's, deciding on a 61 or an 81, just made me think, how come it's "a 61" but "an 81"?OK back to subject, it would also depend on what your using it for and how often will it be driving, distance, hire out, ect. Somewhere I just saw a beautiful white 61 convert, the 61 Limo would be good to match that for your personal use or to accational hire out, if you just like the 81 because you had an 81 Eldo and liked the seat lay out in an 81 remember not all 81 Limos were factory and could have different seating arrangements, or you could find an 84 with same seating arrangement but then youd have the 4.1, I think 84 was the last year for the factory RWD limo, how about an 86 up stretch? That would have about the same look as an 81 with a better motor. So the 61 would be nice to match your 61 convert but as far as a newer 1 I think you can have a wider range to chose from than just 81, say 77-84 or 86-92 stretch. I have noticed though looking for a 1996 Fleetwood Brougham sedan, limo's come up in the same search weather I'm looking on eBay or autotrader.com that a comparable condition and mileage limo isn't more and sometimes less than a passenger sedan. You could get the limo and hire out a driver for the day.