Swapping whole engine vs swapping cylinder heads?

which one is quicker to do? I want to do these my self with a haynes repair manual. I'm thinking of buying cars that need fixing and selling them for a profit. which one would be quicker and or cheaper to do? swapping heads or the entire engine? thanksSwapping whole engine vs swapping cylinder heads?
Depending on what you are working on gasket sets can be very expensive, also some heads can be difficult to get at with the engine still installed.Swapping whole engine vs swapping cylinder heads?
Swapping heads won't fix engine problems in the crankcase (worn bearings, bad piston rings, etc). Each year, make and model of car has its own idiosyncrasies that make it tough to give you a good number to work with. One may be easier to swap the engine, while another may be easier to swap the heads. If you are doing it to make it look like the engine was overhauled, you'll earn a bad reputation problem you'll never recover from.



Changing heads or the entire engine can both be difficult on new cars. There's a lot of stuff that has to be removed just to get to the engine itself. I would buy cars that are already in good condition that just need cosmetic work - touch up paint, tune up and a general cleaning.



Also, depending upon where you live, selling more than 3 to 5 cars a year requires a dealer's license. Remember, your name will appear on the title documents and that's how they will know you are a dealer.Swapping whole engine vs swapping cylinder heads?
It depends on the year, make, model, engine option, and other drive option like AWD, 4x4 and such. Also depends on why you think the head has to be swapped. IMHO its pretty darn rare that the head is going to be the only issue with an engine. Pulling the motor and getting it in a stand will make it much easier to inspect it to decide if it needs more than just a head. If it does just need a head you can then replace the head clean it up nice and throw it back in knowing that you had a good look at everything else and its all good. If you find more issues you can address those issues (like leaky gaskets) while its out and then know you are putting in a good motor. If the motor needs a ton of work you can just junk it and go get another one, you have not lost anything.
The best and easiest thing to do is sell cars that do not require repair. You're going to get eaten up by labor and parts costs. If you are going to take the engine out, it might not be a bad time to replace the heads, but I have done all these things over many years and it kicks ***. Best to deal with cars that run well already.