on first start up after oil priming system, did you let it get to full operating temp and then dump oil and filter?
Also when you honed cylinders, did you clean the cylinder liners with a brush, soap and water? Did you clean the block oil galleys etc?
Wait with a thick head gasket you're going to drop compression and loose some power there haha. But it shouldn't be THAT much loss of power lol. Who did your tuning?
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