Do you know the piston to bore clearance?
I have just fitted a rebuilt RB30/25 with Mahle pistons and the motor has very loud piston noise.
After 100klms with no change in the noise, I have pulled my motor out again and rechecked the clearances
and found them to be at .003" as my machinist had set them.
I have since heard that the pistons are race only pistons and not street suitable, that they are always noisy
and should have less clearance.
Do you know if this is correct?