The pistons are Alloy 2618 T61. Bore 89,25mm. Ross client page ( http://www.rosspistons.com/wp-content/uploads/2016/08/Piston-Install-Auto-Ross.pdf) states 0,003 for street use, 0,006 for turbocharging.
This raised my question:
My machineshop thinks that 0,003 is even too much. They do forged pistons in turbocharged Audi, Volkswagen with a clearance of 0,05 mm that is 0,002 inch. Never caused problems. At my time of visit they had an Audi S3 five valve engine that had to be build with Wiseco pistons. They choose a clearance of 0,002.
Please share your experiences. What clearance did you choose and how did the engine behave regarding clatter and oil consumption. Did it fail with less clearance?