Re: cracked power head.. repaired?
Since the cylinder liner is supported by the aluminum casting, I doubt that those cracks could be adequately welded. Differential expansion would likely re-crack it. Full penetration welding will most likely damage the aluminum. Anyway, even after full penetration welding, you would need to overbore the cylinder. better off to start looking for a good used block.
If the aluminum is not cracked, these blocks can be re lined for around 200 per cylinder--but you need an experienced machine shop to do this correctly. I haver never had it done. I feel it is more economical to just buy a used block.
