: engine options for 4100 RWD



fletwd85b
07-31-09, 02:02 PM
i have a 85 fleetwood bro. my mechanic said to start looking for another engine.
im no mechanic, i have read some information on engine options one listed is 307-cubic-inch (5.0 L) these are in some olds/buicks/chevys/(from1980-90) its list options for 86 brougham not 85. from the stuff i have read not much difference from 85 model to 86 can it be done or will this need mods of some kind).
The other option is this LG8 307-cubic-inch (5.0 L) this was in olds 442 (1983-87)and some 1985-1988 Cadillac Broughams.

so far i have been able to find a 307 i a 1984 Olds Delta 88 and a 307 in a 1984 BUICK ELECTRA PARK AVE. will one of these work on the 85 caddy.

thanks for any information

Aron9000
07-31-09, 02:24 PM
i have a 85 fleetwood bro. my mechanic said to start looking for another engine.
im no mechanic, i have read some information on engine options one listed is 307-cubic-inch (5.0 L) these are in some olds/buicks/chevys/(from1980-90) its list options for 86 brougham not 85. from the stuff i have read not much difference from 85 model to 86 can it be done or will this need mods of some kind).
The other option is this LG8 307-cubic-inch (5.0 L) this was in olds 442 (1983-87)and some 1985-1988 Cadillac Broughams.

so far i have been able to find a 307 i a 1984 Olds Delta 88 and a 307 in a 1984 BUICK ELECTRA PARK AVE. will one of these work on the 85 caddy.

thanks for any information

Either of those will work, but the 307 is a total dog in these big, heavy cars.

If you're going to bother swapping out a motor, I'd look for a 350 chevy with a 700R4 trans(your current trans won't bolt up to the Chevy motor, but the trans in your car is pretty weak as well)

Vinsanity
07-31-09, 02:41 PM
+1 for the Chevy 350.

Although I really just wanted to chime in and say that I've always wanted to drop some kind of V-series motor (LS2, LS6, supercharged Northstar) under the hood of a 1980's RWD Deville/FWB. Especially a black early-80's Coupe Deville with some kind of custom stainless-steel roof. Yum.

sven914
07-31-09, 05:40 PM
The 307 isn't bad. It is defiantly an upgrade from the 4100, but if you are used to the lack of power the 4100 offers, and may even like it, then the 307 will keep your car feeling right. It won't give you that kick in the pants, tire burning, run from the cops power the 350 gives, but it it will give a more responsive feel with a smoother acceleration.

jayoldschool
07-31-09, 05:51 PM
What's wrong with your 4100?

fletwd85b
07-31-09, 08:52 PM
i can get a 5.7L 190 hp V8 from 1994 Chevrolet G-Series Van with what i think is 4L60E automatic transmission will this work, or must it have the 700R4.
can you tell me some cars that will have this 350 with 700R4 transmission.
thanks for the info.

fletwd85b
07-31-09, 09:00 PM
What's wrong with your 4100?
not sure shakes like crazy when stop loud ( medal thump knock) on passenger side back of engine.
mechanic wont look any further(new plugs/wires and cap ok per mechanic).

sven914
07-31-09, 10:51 PM
i can get a 5.7L 190 hp V8 from 1994 Chevrolet G-Series Van with what i think is 4L60E automatic transmission will this work, or must it have the 700R4.
can you tell me some cars that will have this 350 with 700R4 transmission.
thanks for the info.

The 4L60E is a 700R4, except it has electronic controls, which require computer input. The following is a list of cars that have the 700, but anything after 1992 is the 4L60E version of the 700R4 and will not work in your car.

1982 Chevrolet Blazer/GMC Jimmy
1982-2004 Chevrolet Corvette
1982-1996 Chevrolet Caprice
1983-2002 Chevrolet Camaro/Pontiac Firebird
1985-2005 Chevrolet Astro/GMC Safari
1991-1992 GMC Syclone
1991-2003 Chevrolet S-10/GMC S-15/GMC Sonoma
1991-1996 Cadillac Fleetwood/Cadillac Brougham/Cadillac Limo
1988-2003 Chevrolet Suburban

The engine out of the van might work, but it might have computer controlled features (throttle body injection) that will not work with your car. If your looking for an easy conversion (no computers) you should go with the LM1 version of the 350, which was the base 350 small block used from 77-88, in most passenger cars. It is a basic carburetted engine that would make your swap much less complex.

The Old's would be a nice computerless swap; being carburetted it doesn't require the electronic computer controlled carburettor which it came with from the factory.

jayoldschool
07-31-09, 11:46 PM
loud ( medal thump knock) on passenger side back of engine

Ahh, the 4100 death knock. I have had the unfortunate opportunity to witness this myself.

Easiest option? Put another 4100 in it. You could always just change the bearing in yours and turn the crank. You could put an Olds 307 in and still use your trans. A Chev 350 (as others have said) will require a new trans, mounts, accessories, and wiring.


but anything after 1992 is the 4L60E version of the 700R4 and will not work in your car.

Close. The B and D bodies still got the 700R4 in 93.

arnauts
08-02-09, 02:26 AM
Close. The B and D bodies still got the 700R4 in 93.
Yeah, but it was called the 4L60, yeah?

jayoldschool
08-02-09, 10:10 AM
Yeah, but it was called the 4L60, yeah?

Yes, but it is not a 4L60E. The 4L60 is the 700R4. GM just changed their nomenclature.

fletwd85b
08-02-09, 01:52 PM
the olds 307s i found have been sold ,im waiting to hear about a chevy 305 from a caprice 83 with motor&tranny /carb(willnot be using fuel injected/throddle body i want this to be somewhat simple) this is a 4speed. the 85 fleetwood has an overdrive shifter shows P /R/N/D/3/2/1(or will i simply loose a gear). what can be done about this or must i find a tranny that has overdrive(can some one give part or model#).
thanks for all the information
it has helped.

sven914
08-02-09, 02:14 PM
83 Caprice might have an overdrive transmission, with the 305 (it was an option). The overdrive transmission would be a classified as a four speed.

fletwd85b
08-02-09, 02:39 PM
so sven this will or will not work im waiting for this person to see if this engine&tranny have overdrive.
thanks again for all info.

jayoldschool
08-02-09, 02:57 PM
Personally, I would look for something newer. The early GM OD transmissions (if that 305 has one on it, and it probably doesn't), were notoriously weak. Also, that 83 still has a flat tappet cam. Not a good thing considering all the zinc has been removed from oil these days (check it out on google). If you are going to go Chevy, find an 87 up roller cam 350 with a 700R4/4L60 behind it. 90 or later would be the best for the trans. If you don't want to keep it FI, just pick up an Edelbrock intake and 600CFM electric choke carb to go on it.

Stingroo
08-02-09, 03:17 PM
All bow to Jay and his vast engine knowledge. lol Honestly, it amazes me every time I read a thread here.

jayoldschool
08-02-09, 05:00 PM
Sting, you are going to make me blush. There are guys around here that know waaaaaaay more about cars than me. I just try and help out when I can, and try and keep my mouth shut about topics that I have no experience with...

fletwd85b
08-04-09, 03:39 AM
so the chevy 305 i have been looking at does have overdrive,
im going to see it this week .
this should fit my 85 RWD ftwd?
any additional info will help.
i understand it would be best to get chev350 or olds307 i just cant find in my price range within few hours from me.

thanks for all info once again to all.

cadillac_al
08-04-09, 09:31 AM
This does not sound good to me fletwd85b. If you have to pay somebody to do this, it may cost more than it is worth. I think all the GM cars in the early 80's shifted like crap and were always gear hunting. That 83 Impala may even have the th350c. If the 83 Impala does have the 700r4 you might be alright although it would be an early version of the 700. (I thought they came out in 84) I think a lot of mechanics weren't up on adjusting TV cables back then and that's why people couldn't get their weird shifting fixed. A properly adjusted 700r4 will shift flawlessly but I have never experienced one shifting perfectly in a pre 86 vehicle.