Thanks for the response. I'm inclined to agree with you on all points.
I sent a message & photos to L.A. Sleeve & they replied promptly saying they had put new sleeves in a Vanguard block but not often enough to make notes about the process or what sleeve to use or make. The reply made it seem like a custom job, and they had to bore out the old sleeve in order to make a new sleeve fit. I didn't ask about the cost. They also confirmed that the factory sleeves are molded into the alumium during the casting process, so there's no pressing the original sleeves out.
I'll probably buy an engine for the machine, a Husqvarna MZT52.
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