Azes 2740: Can’t Work Out The Code...
Crosswords31 mins ago
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For more on marking an answer as the "Best Answer", please visit our FAQ.You will have damaged the cylinder linings and the pistons will need to be extracted and the engine will need reboring which needs special equipment.
Depending on the engine and how bad the seize was the engine may be beyond economic repair.
However if you can get a replacement engine it is possible to replace the engine yourself on most cars but you would need a decent place to work and to rent kit like an engine crane.
As you're asking the question I'd assume you've not attempted anything this complex before but in theory with time and facilities you could learn on the job but I wouldn't recomend it.