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hypereutectics don't expand as much when they heat up, so you can set their clearance tighter during assembly. Forged pistons grow alot when they heat up, so they are loose in the bores when cold. How much clearance you need is one of those things where you will have a hard time getting different engine builders to agree on, to the exact numbers. I have seen enough wasted pistons in my short life to put forged slugs in all my motors, but I don't baby them either.
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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