Originally Posted by
Roelof
It can mean a lot, just feel the pinch at the first shut down when it is cooled down. If the piston did not gat a kind of heat treatment in the factory the pinch will get bigger.
Just be carefull and be sure how the piston will act during the break in before you push up the performance.
You maybe right the pinch feels stronger after the first tank I will run many tanks before I do any performance tunimg.