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What brand pistons are they? I don't know about others, but K-B hypers place the top ring closer to the top of the piston, so they get hotter and require a larger gap. As I recall, K-B recommends .026" for a 4" bore (normally aspirated), instead of the more common .016". Some folks have been known to ignore this, for whatever reason, but they are flirting with disaster.:oops:
 
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