3800 series II or III swap into 79 deville? - Page 3
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RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, 3800 series II or III swap into 79 deville? in Past Cadillac Vehicle Discussion; I would seriously consider the 5.3L swap. The 3800 is ok, my SC3800 has got 33.5 highway (nightime, 70 mph, ...
  1. #31
    N0DIH's Avatar
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    Re: 3800 series II or III swap into 79 deville?

    I would seriously consider the 5.3L swap. The 3800 is ok, my SC3800 has got 33.5 highway (nightime, 70 mph, 50F temps, no traffic, careful driving) on a round trip. It does ok for a wrong wheel drive 3800 lb car and 2.93 gears.

    But a low mileage 5.3L from car-part.com is really really hard to beat. The 5.3L's will do mid to high 20's easily mpg with OD and a truck intake and taller gears. And you have 300+ hp on tap when you nail it. The 3800 is FAR less refined of an engine. It is still a buzzy 90 degree V6, it won't change that. A 60 degree V6 is smoother (by nature). But the GM 60 degree V6's suck on power. Even the newer 3.5L and 3.9L are lame.

    The SC3800 can go nicely, you will want that one over a NA 3800. But the 5.3L is cheap, very very plentiful and FAR more reliable.
    Stingroo and Stingroo like this.

  2. #32
    ferrisworld is offline Cadillac Owners Fanatic
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    Re: 3800 series II or III swap into 79 deville?

    Well, like I posted earlier, I can't use the 5.3 unless I convert the FWD version since there are no 5.3s besides FWD that come in a car.

  3. #33
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    Re: 3800 series II or III swap into 79 deville?

    It's the same motor, isn't it? All you'd need is a RWD trans.

  4. #34
    N0DIH's Avatar
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    Re: 3800 series II or III swap into 79 deville?

    All 3800's are FWD bolt pattern (even ones in F-Bodies).

    Find a 5.3L/4L60E (or 4L65E) and drop it in, that would be the sweet ticket.

    Looking at Car-part.com found a 64k mile 5.3L (2006 engine) for $500, and a 4L60E for it with 59k for $500. So a total of $1k in drivetrain, then need some things like PCM, they are cheap, a PCM tune for it (most likely need some stuff like VATS turned off), a high pressure fuel pump and some elbow grease and you have a very very solid driving Cadillac that will go to the ends of the earth getting good mpg and be able to tow 5000 with relative ease.

  5. #35
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    Re: 3800 series II or III swap into 79 deville?

    No he's saying he can't swap in a 5.3 from a truck because of California laws, he COULD, however, swap one in from a car (Monte Carlo/Impala SS).

    Question is, are they the same bolt pattern both ways like the 3800s? If so, that'd be the way to go.

  6. #36
    ferrisworld is offline Cadillac Owners Fanatic
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    Re: 3800 series II or III swap into 79 deville?

    http://en.wikipedia.org/wiki/GM_LS_engine

    It's the LS4. Different bolt pattern, and shorter crankshaft. I looked for 5.7 LS1s from 98-02 f-bodies, and you can't find lower mileage ones for less than $2,000 around here.

    Actually, I guess the f-body v6 transmissions with bolt to the LS4. I don't know if the v6 4L60E can take the torque from the LS4 though. I would imagine it could.

  7. #37
    N0DIH's Avatar
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    Re: 3800 series II or III swap into 79 deville?

    I used to have a good article on engine swaps per state, but more or less IIRC California was engine family, with emissions needing to meet the car as a minimum, but if they knew much about it, then it might need to meet the engine.

    So a 4.1 is kin to the 4.5 and 4.9L, and the 91-95 4.9L's were good on power and fuel econ (I got 27-29 highway on mine with 2.73's in my 91 Deville) and it is a near bolt in, but will need wiring changes to use the PFI, which I would use for sure. And if stock injectors, replace with 19 lb/hr Bosch's, replace on site, the stockers sucked bad. 200 hp/275 lb/ft torque. All at low rpm. But the HT4100 cars were all 3.42's, and high alt HT4100 cars were 3.73's factory.

  8. #38
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    Re: 3800 series II or III swap into 79 deville?

    Go with the 4.8 version of the LSx instead of the 5.3.

  9. #39
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    Re: 3800 series II or III swap into 79 deville?

    Only problem is the 5.3L is made at 4x the production volumes of all other Gen III V8's combined. So the 4.8L's tend to be more costly, but it is better for mpg. 270hp to 290 hp (depending on year), can't argue with that and no multiple valves. Sorta snubs the Northstar 4.6L eh?

  10. #40
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    Re: 3800 series II or III swap into 79 deville?

    But the 4.8 is still a truck engine. I guess I could just talk to some refs and see what they say. The 4.9 Caddy engine would still have to be converted to RWD, which if it isn't changed much from the HT4100 bolt wise it might go in, but the 4.8 would be better I think.

  11. #41
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    Re: 3800 series II or III swap into 79 deville?

    You can always use a FWD 96 to 99 Northstar CAR engine in a RWD setup just like the Shelby S1 ran. This runs on an LS1 PCM and not the FWD Northstar PCM.

  12. #42
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    Re: 3800 series II or III swap into 79 deville?

    Arghhh, who would want to spend money putting a N$ in anything?

  13. #43
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    Re: 3800 series II or III swap into 79 deville?

    I am actually doing a tune for a guy that is installing a 2000 to 2005 Northstar in a Cavalier with a manual trans and we are going to run it on a 2001 LS1 PCM. The guy is up by you

    What can you say bad about a 2004 plus FWD Northstar?

  14. #44
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    Re: 3800 series II or III swap into 79 deville?

    ZERO aftermarket.



    Edit: Hell, I retract that statement, and revise it to NEGATIVE aftermarket.

  15. #45
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    Re: 3800 series II or III swap into 79 deville?

    I thought the Northstars were safer from 2005 and up. As far as head gasket problems.

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