i contacted manley about the tight ring gaps myself when i installed mine. they said the reason for the tighter ring gaps on their pistons was because their ring lands are lower down on the piston, further away from the heat. this is supposed to allow for tighter ring gaps. i remember opening mine up a bit though because i was uncomfortable with how tight they want you to make them.
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02 lightning all stock
99 mustang gt Tork Tech terminator kit making a little boost
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