4.5 or 4.9 Engine
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HT4100 4.1, 4.5, 4.9 Discussion, 4.5 or 4.9 Engine in Cadillac Engine Discussion; Hi! I have a crate motor that is either a 4.5 or a 4.9, how can I tell which one ...
  1. #1
    melmac313 is offline Cadillac Owners Member
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    4.5 or 4.9 Engine

    Hi! I have a crate motor that is either a 4.5 or a 4.9, how can I tell which one it is? Is there a certain set of numbers I should be looking for? Thanks for any help.

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  3. #2
    the recluse is offline Cadillac Owners Connoisseur
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    Re: 4.5 or 4.9 Engine

    That's the 4.9, the 4.5 wasn't PFI.

  4. #3
    Sevillian273's Avatar
    Sevillian273 is offline Cadillac Owners Connoisseur
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    Re: 4.5 or 4.9 Engine

    It was pfi only in 1990.

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  6. #4
    19Eldorado90 is offline Cadillac Owners Member
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    Re: 4.5 or 4.9 Engine

    The 1990 Eldorado has a pfi 4.5.

  7. #5
    the recluse is offline Cadillac Owners Connoisseur
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    Re: 4.5 or 4.9 Engine

    Quote Originally Posted by Sevillian273 View Post
    It was pfi only in 1990.
    Quote Originally Posted by 19Eldorado90
    The 1990 Eldorado has a pfi 4.5
    I was remiss, thank you both for the correction, I was thinking of something else

    Now the question still remains because we have done nothing for this gentlemen.

  8. #6
    Sevillian273's Avatar
    Sevillian273 is offline Cadillac Owners Connoisseur
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    Re: 4.5 or 4.9 Engine

    He posted an identical thread the same day and i answered him. Its a 4.9 in the pic. The 4.5 pfi has a different pcv line and a round coil cover not to mention a ridiculous mess of piping for the Air Injection Reaction system which was deleted in 1991 and later.

  9. #7
    the recluse is offline Cadillac Owners Connoisseur
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    Re: 4.5 or 4.9 Engine

    Quote Originally Posted by Sevillian273 View Post
    He posted an identical thread the same day and i answered him.
    Ahhh, I see.

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