Spherical Dish top piston 

4.127 bore 4.120" gauge point

1.140" CH

Pin fit for .928 wrist pin

1.5mm , 1/16, 3mm rings

pistons have side gas ports

New  moly rings included

No wrist pins or clips

This would work with 3.75 stroke ,6" rod with 9.025" deck block and would be .010" down

These pistons are New. They were a custom order from 15 or 20 years ago