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Thread: Olds 350 or 307 to 1969 Cadillac?

  1. #1
    3dfx is offline Cadillac Owners Member
    Automobile(s): Coupe de ville 1969
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    Olds 350 or 307 to 1969 Cadillac?

    Im beginning to rebuild my original 472 and I've been thinking some other engine to my cadillac for the time until my rebuild is ready.

    I live in Finland and Olds 307 and 350 engines are cheap in here. How difficult is to install an old olds engine to my car?

    Engine rebuilding can be long project (i don't know how much machining my engine needs and how much money that costs)I would like to drive with cad while rebuilding my original 472 engine.


    Those olds engines should bolt to cadillacs BOP tranny without problems? HOw about engine mounts? Are those in same place they are in Cadillac engine?


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  3. #2
    deVille33 is offline Cadillac Owners Connoisseur
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    Re: Olds 350 or 307 to 1969 Cadillac?

    Do not bother with the 307 engine, it will not have enough torque to pull that heavy a car well. The 350 would be the better choice, but you should also consider changing the rear end gearing. If you have 3:23 or lower gear set, you will be alright. Oldsmobile also had another engine which would be better suited for this swap. The 403 would be much better for this than the other two. Oldsmobile also had one other engine the 455, but is now a rare item and not likely to be found anywhere but in the Submariners shop.

  4. #3
    The Ape Man's Avatar
    The Ape Man is offline Cadillac Owners Connoisseur
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    Re: Olds 350 or 307 to 1969 Cadillac?

    Bellhousing bolts right up. Engine mounts would have to be fabricated.

    Accessory brackets all different. Exhaust completely different. Radiator hose positions might me different too.

    Lots of fabrication but not impossible.

  5. #4
    BRUCE ROE is online now Cadillac Owners Fanatic
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    Re: Olds 350 or 307 to 1969 Cadillac?

    A late 70s Olda 350 will get you around on low octane unleaded; a 403 will do better. Neither will compare
    with the performance of a high octane leaded burning 472. Bruce Roe

  6. #5
    3dfx is offline Cadillac Owners Member
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    Re: Olds 350 or 307 to 1969 Cadillac?

    Oldsmobile also had another engine which would be better suited for this swap. The 403 would be much better for this than the other two.
    Yeah, but those cost more and are more rare than 350 or 307. We have lots of eighties 307 and 350 here and they cost something like 50 to 100 euros.

    There are two criteria for this swap:
    1. The engine is cheap
    2. The swap won't consume huge amout of work

    Do not bother with the 307 engine, it will not have enough torque to pull that heavy a car well. The 350 would be the better choice, but you should also consider changing the rear end gearing. If you have 3:23 or lower gear set, you will be alright.
    My rear end gearing is near 3 if my memory serves.

    My car will be very slow after engine swap, but at least I can drive with it.

    In the past, people here used to swap nissan 2.8 diesels (those have something like 80hp and 150NM of torque) in fullsize-GMs like chevy caprices and olds custom cruisers.......I wonder how slow they were I have seen one mopar with tailfins which had old Perkins tractor diesel

  7. #6
    deVille33 is offline Cadillac Owners Connoisseur
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    Re: Olds 350 or 307 to 1969 Cadillac?

    If you chose to go with the 307 ( which I wouldn't ) be aware that there were two variations of this engine. One used a hydraulic cam and the performance model used a roller cam. The roller cammed engine performed well, but if it was used hard the bottom end of the engine suffered. The block webbings would distort terribly. Go for the 350.


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