Piston question

As stated, KB107s are fine if you run the right gap. I ran a set daily and Hard for 6 years. My oldest son used those exact same pistons for over 7 years until his recent roller lifter failure.

He built that motor when he was 18, so I doubt he took it easy on it. 2 years ago he swapped to the solid roller.

Because of the cam trash that went through the motor, he ordered a new set of the 107s.

Now the IMPORTANT part! His new set had one piston .0072 too small, would have had .009+ clearance at 4.03 bore. That was a setback time wise. So, I recommend measuring them, as soon as you get them!