I'd say the main problem you'll be looking at is a lack of power. That engine, by the way, was a small-bore variant of the well-regarded 425-cube V8, which first saw service for 1977. If you want to mount the 4100 sensors, I'm told the threads are not metric after all. The tires are new and ready for more driving. Several weekends and week nights.
But is there anything else going off that information from the description? This provides a very small surface area where the cylinder head meets the block. Put on a connector and presto! It had 94,000 miles on the clock when I bought it, and 150,000-ish when I bent the unibody in an accident and had to scrap it several years ago. Also, check your safety features. You can either drop the column and transfer the parts from the Olds to the Cad so the cable will connect, or modify the Cad's linkage mounting point that originally attached to the 4100's exhaust manifold. Additional issues included oil-pump failures and head bolts pulling free of the block. Make sure the cruise control works, if the car has it.
Then it's a matter of supporting the rear of the engine with the cherry picker, removing the jack, and installing the rear trans brackets. They were much better cars. Many today have seen well over 500K miles with nothing but water pump changes and basic repairs. Get yourself the proper flywheel or call National Automotive Lines 1-800-428-4300. See bottom of page for details. These were good cars and rare too! Ask for records, follow the maintenance schedule, and either have money on hand for repairs or be willing to get your hands dirty and learn about cars.
It had very little power, even less torque, with a small transmission that failed too and tiny differential behind it. Even 4100s suffer from weak fuel pumps too and are often misdiagnosed. Depending on the mechanical condition of the vehicle, work might need to be done on the car. Notice the driver side exhaust pipe that interferes with engine removal, it decided to rest on the transmission electrical connector before being 'persuaded'. As a 17 year old, like you said, money is going to be the biggest problem with buying this car. While there is a strong emotional tie to this car, since I have had it since it rolled off the truck some 24 years ago, I am not that sure I would want to go through the expense of an engine replacement. I can't blame that problem on a fault with the car, as I wasn't as careful as I should have been with some work I was doing and may have damaged the head gasket myself.
Ah, O2 wire can be cut, as well as the air diverter valve connections. It's not something you want to do preemptively: if the head gaskets are good, keep them. This car is not showroom perfect, but for a car that has been used over the period of 37 years it is in very good condition. The engines got bigger and incorporated new technology while the cars got smaller and lighter, so the underpowered argument starts to go out the window. I think if they had mated the 6 liter engine to a four speed with overdrive they would have gotten decent enough fuel economy out of it to hold off on the 4100 for another year or two. This author recalls riding in a Cadillac limousine equipped with the V8-6-4 engine sometime in the 1990s. I haven't owned one myself, but I've talked to some Allante owners who love them - they're definitely more reliable than the first gen Northstar the Allante got in '93.
Some things to think about. You'll need this from the donor car the 4100's is slightly different See pictures of installation. The 4100 ready to be pulled. This is the worst thing you can do to a 4100. Cadillac General Motors, really enlisted the assistance of industry supplier Eaton to develop the valve gear necessary to facilitate the action of shutting down cylinders on demand. Have your mechanic neighbor check it out. Especially the 6 cyl mode as it vibrated.
Do not miss your opportunity to own this beautiful Cadillac Fleetwood! As the years went by, they corrected the problems , one by one. There's no easy way to remove bolts A, B and C on the driver's side, so we pulled out bolt D and placed a floor jack underneath that corner of the trans. The Olds block connects to the heater core in two places. Every parameter of engine performance could be displayed on the panel while the car was being driven. This was obviously good news for Cadillac—especially after the division had suffered through two trouble-prone engines in a row.
I remember being passed by a U haul in an 83. Hopefully you've got it taken care of from here. This is not something you will get done in an evening. By placing a jack under where the trans will sit, the whole package will level out when the rear makes contact with it and the front engine mounts will drop right into place in the crossmember. What's needed is an '82 or later U shaped, one piece bracket, from an Olds or Riv. There are also oil cooler lines to disconnect, and transmission cooler lines to disconnect. I took advantage of it all the time when I had one as a daily car.
No other car can say this for 1981, and not many can say that at all. Just make sure you find a place that has done them before. Customers were also dissatisfied with engine smoothness in the 4- and 6-cylinder modes. Well, my buddy of mine bought the car in 2004. It was good enough and 40 miles better than the 4100, and a huge power improvement over the decently reliable 5. The grommet is the pivot point, and both holes fastened to the side of the engine at the old exhaust manifold.
I had to replace the rear head gasket once, so I speak from experience when I say it is a royal pain in the ass if the engine is longitudinally mounted, it's a bit more manageable. Consider installing temp and pressure gauges since the stock idiot lights can't be seen in daylight anyway! Thanks Jeff for the pict and Bruce for the part The deep sump oil pan ready for installation. I think most states will allow you to go to a later model motor as long as you transfer all the emissions equipment and it was a factory option for the same family of cars. Causing notorious head gasket leaks and cross contamination of oil and antifreeze. On the passenger side, the 3 bolts holding the U-bracket on were accessible so we removed them.