good pistons¿?

The ad states they are the same as stock except for bore size.
I think you can run stock pistons without a base gasket. I have not done this myself. The tiny bit of extra compression can't make up for the possibility of oil leaks.
If you want to run with no base gasket or a thinner head gasket you need to assemble the engine with such a set up and check piston to head clearance.
Leo
 
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