Should I just buy a engine thats already built?

Having no experience. Would it be smarter to buy an engine that has already been put together than to build my own from the 289 I already possess?

My car has 83000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Hey there Griffin. If I were in your position, where I had never rebuilt an engine before and wanted to get my Mustang running, I would save my money and buy a rebuilt motor that is carburetor to oil pan. This way you know it’s refurbished, properly jetted and tuned; essentially it’s add oil, install, break it in and go. There are several websites you can order from; or contact a local engine replacement shop to see if they have older-style Ford Small blocks. This would be the smartest thing to do.

How to Identify and Fix Common car Problems ?

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Your 66 Mustang was built to handle a small block V-8 Ford. The size of the small block Ford`s 289, 302 and 351 are identical. They gain cubic inches by having larger bore and stroke in the combustion chamber.
You`ll need a V8 to swap into your Mustang. Whether you want a modern engine, like an LS or a Coyote, or a V8 from the same era, you`ll also need motor mounts, accessory brackets, a flywheel (or flexplate if you`re doing a V8 conversion but also want an automatic transmission) and motor mount frame brackets.
On average, you can expect your Ford Mustang to last about 200,000 miles. With proper care, however, it can last even longer.
To get the 4.6L four-valve into a `64 to `66 Mustang chassis, everyone agrees that the shock towers need some fabrication. Dimensionally, it is possible to install a four-valve engine without cutting, but this swap is about more than just wedging a modern engine into an old chassis.
The 1966 Mustang debuted with moderate trim changes including a new grille, side ornamentation, wheel covers, and gas cap. Ford`s new C4 “Cruise-O-Matic” three-speed automatic transmission became available for the 225 hp V8.
If the rest of the vehicle is in good condition mechanically and is a newer vehicle, an engine replacement could be the best option budget-wise. Engine replacement or rebuilding can be cost-effective when it comes to saving money rather than spending thousands on a new vehicle.
All in all, modern car engines are more efficient, smaller, relatively more powerful, smarter, and less prone to wear and tear. On the other hand, repairs and servicing now require more skill and consume more time.
Advantages of a V8 engine

The power of eight cylinders allows for heavier hauls and higher towing capacity. More power also means quicker acceleration and speed. If you prefer a performance vehicle with more power, endurance, and an exceptional feeling off-road, the V8 engine is a great fit.

If you`re looking for speed and practicality, you should look for a sporty sedan daily driver. However, if your heart beats to the sound of a Coyote V8, you should drive your Mustang GT. Unless you live somewhere with two months of dry roads, you can and should drive your beloved pony car.
For best overall vehicle and engine performance, premium fuel with an octane rating of 91 or higher is recommended.
1965-1970 Ford Mustang

The 1965-1970 model of Mustang is the premium option for first-time restoration due to their mass production. Because of their mass production, there are plenty of them to go around for restoration projects.

This 1966 is easily able to accommodate the 5.0L (or a 347 or larger stroker engine), even with the late-model`s serpentine-belt drive and related accessories.
A crate engine is a drop-in replacement motor that can be either bigger, smaller, or the same size as the one that was in there before. Crate engines are typically ready to run and can be swapped right into your Mustang.
The final 4.6 L engine was produced in May 2014. The engine was a 2-valve version and installed in a 2014 model year Ford E-Series van.
This 1966 is easily able to accommodate the 5.0L (or a 347 or larger stroker engine), even with the late-model`s serpentine-belt drive and related accessories.
Venomous strike: The all-new 2020 Mustang Shelby GT500 will produce 760 horsepower and 625 lb. -ft. of torque, making it the most powerful street-legal Ford ever – with the most power- and torque-dense supercharged production V8 engine in the world.
As already stated, the 65-66 Mustang engine compartment will require major surgery in order to fit the 390 into it.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Should I just buy a engine thats already built?
ANSWER : Hey there Griffin. If I were in your position, where I had never rebuilt an engine before and wanted to get my Mustang running, I would save my money and buy a rebuilt motor that is carburetor to oil pan. This way you know it’s refurbished, properly jetted and tuned; essentially it’s add oil, install, break it in and go. There are several websites you can order from; or contact a local engine replacement shop to see if they have older-style Ford Small blocks. This would be the smartest thing to do.

Can front wheel drive car engine power rear wheel drive
ANSWER : Anything is possible with enough engineering. The changes you are looking at would take major structural changes and would definitely not be an easy job. You could possibly consult a manufacturing engineer to get more details on how this could actually be carried out and whether it would be feasible.

How do you replace the rear & side engine mounts without lifting out the engine? & how do you lift the engine out?
ANSWER : Hi…thank you for your questions. If required in the application, a portable engine support bar is used to support an engine during mount replacement. The support bar has lifting capability as well so that the mount can be unloaded and removed. If a particular repair application requires a "crane" (complete engine removal for instance), such are portable these days in any event. With regard to the exhaust system repair, mechanics use ramps to gain access. Six ton portable jack stands will safely support a car two feet into the air which provides more than enough access to repair or replace any exhaust system component. If you desire replacement of the mounts, please refer to YourMechanic’s motor mount replacement service page. For exhaust leaks, please use the exhaust system inspection/repair page page. Once on each of those service pages, if you click on "Get a Quote" and enter your vehicle information (year, make, model) you can obtain cost info and schedule the service. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Should I replace my engine or buy a used car?
ANSWER : Considering that the price to replace your engine and the cost to purchase a new vehicle are in the same price range, I would choose the option that takes less time. This will remove this headache from your life sooner. If you think that you could find a new/similar vehicle to purchase before the parts are available and labor completed, I would do that. If you think that the car search will be long and tedious and also have a trusted mechanic who can get the job done quickly and efficiently, I would go that route.

Engine malfunction light, reduced engine power, engine powered down
ANSWER : Hi there. There are a lot of things that can cause this on your 2012 BMW M5. I usually start by scanning the computer for codes to see what comes up. If there are not codes then I load test the alternator and the battery to see if they are failing. Low voltage in the electrical system will cause this. If that is fine, then it is usually caused by a failing throttle body. I have seen a lot of these fail due to the motors in them hanging up. If the problem is only happening intermittently, this can make the issue hard to duplicate, but you can still have tests done on the car. If you are going to have this fixed, consider YourMechanic, as a certified mechanic can come to your home or office to test the vehicle and diagnose the Engine Malfunction Light.

Check engine light refuses to go off after engine replaced
ANSWER : Hello there, you have a long series of issues going on with your 2013 Hyundai Sonata. If you keep getting a repeating oil light on than there is likely a fault in that system.

Since this fault has lasted after the engine was replaced it could be a oil pressure sensor, wiring harness fault, ECU fault, oil pump, oil strainer clogged, or low oil pressure.

To diagnose this issue properly you need a complete vehicle inspection to start from square one and identify the root cause of all this.

I have a 2010 camry. I just recently replaced the engine with a 2014 camry engine. Now I have Four engine lights on. I replaced on
ANSWER : If you swapped the engine from a vehicle that is 4 years newer than the car is then you are going to have electrical and sensor incompatibilities that may not be able to be fixed by just a few sensor replacements. There were many changes in computer and emission related items between 2010 and 2014 engines. I would recommend having a mechanic like one from YourMechanic come to you and compare the two engines to isolate the possible differences and see if the problem can be fixed.

Check Engine light on. Would the computer give all error codes in one shot? How do we know the engine’s condition?
ANSWER : Hi there. From the description you have provided, I’m am inclined to agree with your assessment of a used engine being installed in your vehicle. An inspection of the engine, by a qualified technician could determine whether the engine is sound. The Check Engine Light on and having a TPS (throttle position sensor) code does not necessarily mean the sensor is at fault. Circuit tests should be performed to confirm the fault. The likelihood of the ECM (electronic control module/computer) giving you all the codes at once is remote. Other component failures could occur. Address those as they come up. Even though you already made the purchase, I recommend having your vehicle inspected by a certified technician so that you can get a thorough evaluation of the car’s true condition.