500 in Fleet?
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View Poll Results: Which engine should I go with?

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  • Should I put in a 500cid Cadillac engine?

    14 93.33%
  • Should I put in a 350cid Chevy engine?

    1 6.67%
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RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, 500 in Fleet? in Past Cadillac Vehicle Discussion; Should I drop a 500 in my Fleetwood or go with a 350? Is the 500 swap difficult or easy ...
  1. #1
    Mad'lac's Avatar
    Mad'lac is offline Cadillac Owners Connoisseur
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    500 in Fleet?

    Should I drop a 500 in my Fleetwood or go with a 350? Is the 500 swap difficult or easy as in bolt-on. Like I said before this car is going to be more of a highway cruiser so either way the 4.1 is gonna go.Its just a matter of time and money. I drive my truck to work so not like the down time would bother me. Anyone need a boat anchor?:devillaug

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  3. #2
    lux hauler is offline Cadillac Owners Connoisseur
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    You already know what I'd do
    But you need to do what fits your needs best.
    The 350 will probably be easier to find but you should be able to get a 500 cheaper.
    What tranny does your car have?

  4. #3
    Mad'lac's Avatar
    Mad'lac is offline Cadillac Owners Connoisseur
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    I think its the th400.

  5. #4
    elwesso's Avatar
    elwesso is offline Cadillac Owners Master
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    I THINK YOU KNOW WHAT YOU SHOULD DO!! 500cid!! I dont know about the fit, but the 500 is a huge engine. The 500s were for the 50s-70s huge cadillacs, and trying to put in that monster may be a trip. The 350 would probably fit better, but if at all possible, go the monster. Decisions these days are horrible

  6. #5
    lux hauler is offline Cadillac Owners Connoisseur
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    I'm not sure what bolt pattern your tranny would have but if it's a BOP (Buick, Olds, Pontiac) pattern, the 500 will bolt right to it. A Chevy bolt pattern would need an adapter.

  7. #6
    Mad'lac's Avatar
    Mad'lac is offline Cadillac Owners Connoisseur
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    The popular vote wins. I decided on the 500 V8. No replacement for displacement

  8. #7
    lux hauler is offline Cadillac Owners Connoisseur
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    Cool!!!!!

  9. #8
    caddydaddy's Avatar
    caddydaddy is offline Cadillac Owners Connoisseur
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    Cad engines are cheap! There's a 1970 472 here for $125!!!! Can't beat that!
    And I would take a Cadillac engine any day over some cheap chevy engine!

  10. #9
    HotRodSaint's Avatar
    HotRodSaint is offline Cadillac Owners Master
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    Originally posted by caddydaddy
    And I would take a Cadillac engine any day over some cheap chevy engine!
    Hey some of us have cheap Chevy engines that came OE in our Cadillacs!

  11. #10
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    Well.. The LT1 in the Fleetwoods came from Chevy.. Right? That's one good 350...

  12. #11
    Scrapyard's Avatar
    Scrapyard is offline Cadillac Owners Fanatic
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    Ok, the 500 would be hella cool, but a 350 would be easier. GM put 350's in that body style twards the late 80's if I remember right. You're gona have to do some major cutting to fit a 500. But again, it'll be hella cool. I've seen it done so the option is deffinatly open. Actually, didn't the 80 - 83 models come with 472? Anyway, You're gona need a new tranny regaurdles. That Hydromatic 250 will fall apart backing either of the 2. A new tranny crossmember may be needed, but I'm not positive on that. Nice part is you should be able to use one from an 80's caprice if nessecary. If you have smog where you live I would look into that first. If that's a factor you may be limited to the 350. If that's not a conserne then go with what you want and what you can afford.

  13. #12
    lux hauler is offline Cadillac Owners Connoisseur
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    Actually, didn't the 80 - 83 models come with 472?
    I think that would have been the 425.....but the 425 was a big block too.

  14. #13
    Scrapyard's Avatar
    Scrapyard is offline Cadillac Owners Fanatic
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    ok cool. That's what I was thinking of. Thanks. Still a BB, different animal.

  15. #14
    Mad'lac's Avatar
    Mad'lac is offline Cadillac Owners Connoisseur
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    What is this smog crap?

  16. #15
    Scrapyard's Avatar
    Scrapyard is offline Cadillac Owners Fanatic
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    LOL, I know. We don't have it here in FL either but I notiched some parts of TX have inspection stickers. Wasn't possitive. Something that got stuck in my head living in CA though. It sucks building cars out there. Is this gona pass, is that gona pass? Just look'n out for ya brother.

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