swap 1987 4.1 to 4.5

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HT4100 4.1, 4.5, 4.9 Discussion, swap 1987 4.1 to 4.5 in Cadillac Engine Discussion; I'm thinking of if need be swapping my 1987 Deville fwd 4.1 to a 4.5 what should I know ? ...
  1. #1
    Eureka1000 is offline Cadillac Owners Member
    Automobile(s): 1987 Deville Eureka Funeral Coach
    Join Date
    May 2014

    swap 1987 4.1 to 4.5

    I'm thinking of if need be swapping my 1987 Deville fwd 4.1 to a 4.5 what should I know ? what if anything I need extra ? will it just bolt up ?

    I have had cooling problems with my 4.1

    advise please


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  3. #2
    carnut is offline Cadillac Owners Master
    Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
    Join Date
    Feb 2003

    Re: swap 1987 4.1 to 4.5

    I believe you need to swap over your intake manifold to the 4.5.

  4. #3
    MoistCabbage's Avatar
    MoistCabbage is online now Cadillac Owners 10000+ Posts
    Automobile(s): 2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
    Join Date
    Sep 2010
    East Boston MA.
    There are a few threads on this floating around.

    If you're going to go through the trouble, why not go to a 4.9?

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