.040 over high compression racing pistons.  These are a copy of legendary Cosworth racing design that won more D-production U20 2000 races than any other U-20 piston.
 
12 or 13:1 or more depending on the head thickness and gasket you use.  As with any race piston, it is your responsibility to check valve and head clearance etc.    (Stock heads will require work)
 
 
Modern dimension, extremely high quality rings included. Stainless top/iron second.
 
Moly coated skirts at no additional charge.  Premium USA production pistons.
 
Rings, pins, circlips included
 
Top quality USA production.   Great price! Clearance sale, special order only after these go.