As far as the 500 swap I think you're out of luck.

Let's move this thread over to RWD Deville/Fleetwood for more exposure.

 

As far as the 500 swap I think you're out of luck.

Wow, shutting him down right out of the gate!

Being the the frame and basic layout of the car was pretty much unchanged from 77-96, and the outside dimensions of the 425 and 6.0 that were used in these is the same as the 500, it's not so much a question of if it fits, but hooking it up in general, as Apeman has said previously.

I think the main issue is if you live in an emissions testing area, and also figuring out what to do with fuel management.

If you need emissions tests, then it's gonna be a hard sell, as a 500 is going to put out a lot more smog than a fuel injected HT4100, and some states frown upon putting an engine older the the cars model year into it.

If you are not in an area that requires that, then do whatever works!

 

Thanks! I have already found a few threads about this. I will keep reading...

 

I've done this swap multiple times. You would need a lot of pieces from a 1977-1979 RWD Cadillac with a 425 engine to make it happen.
The factory transmission in your car would not hold up very long either.

 

Thank you APEMAN!

 

No emissions police here! LOL

 

It can be done easy but way out dated and super gas gussied imo great for a horse rod build or drag they make awesome hp but if it was me I'd sell the 500 and get a 350 chevy or LS motor

 

Hey man, your response is what I’ve been looking for. I just now created an account and have been searching for this topic. So, I have a 76 eldorado 500 and would like to install this 350sb I have sitting around from a 95 Yukon (efi). Can you please confirm that this is possible? Any tips on install? Would you happen to know of any videos videos that can help?