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I had to do a top end tear down of my car myself because I could not afford the $ 800 to $ 1500 to get it fixed.

Apart from the wire harnesses , computers, fuel injection, today's engines are basically the same except for performance tweaks that have came down the pipeline since decades passed.

Once someone has a good basic understanding of how a throttle body works, and fuel injectors a top end tear down is as same as cars built in the 60's.
A engine is a , no, wait, a ICE engine and a ICE engine.
A intake manifold is basically the same thing as one from the 60's except you have fuel injector ports and no carb.
Actually ? if you look at it ?
The throttle body set up and fuel injector is more simple than a 4 bore high performance carb from the 60's and 70's.
Don't be afraid to work on your fuel injectors, the only thing you need to know is they pull out of the ports after you have loosen the retainer bolts, and you always use new O rings when you put them back together.
I like the performance with the fuel injection system over any carb system.
A new cylinder head top tear down ?
It's the same as doing a intake gasket except you have to also take the heads off.
Things to remember with doing a cylinder head on a car.
Take the old cylinder head to a machine shop and have them check it out to see if it's cracked, that the surface is true, valves are ok.
In some cases it's better to just get a whole new cylinder head.
Always, Always, Always, use new cylinder head bolts when putting a cylinder head back on a engine.
Torque it down incrementally and slowly, and torque correctly by using a torque pattern.
One way to learn how to work on modern engines in cars of today is to take a engine or car that does not run and you don't care about it and take it apart.
That's how I learn to work on the fuel injectors, before I was afraid to work on the fuel injector and mess something up at great expense.
Most fuel injectors are bolted to the intake with bolts to a fuel rail.
Most fuel injectors have O rings on them to seal the fuel injectors in the fuel injectors in the fuel injector ports.
Once you remove a fuel injectors you always use a new O ring and clean the port and fuel injector.

One way to learn how to work on modern engines in cars of today is to take a engine or car that does not run and you don't care about it and take it apart.

Very good post. For the modern cars, OBD-II can make it a lot easier to know where to look when diagnosing, also.

As far as practicing, one of the recent single cylinder four-stroke FI off-road bikes is a great place to get it, especially since rebuilds can come every 50-70 hours (sometimes a lot more or a lot less). All the same stuff there, plus you only make a mistake once instead of four or six or eight times!