Me brain says you're thinking of ARGO rods, not pistons.... And there's nothing wrong with a 7AFE (I should know, I drive one every day), everyone knocks them until they need the block for a 7AGE conversion.....they are competitive compared to 4AGEs, but obviously not to the ZZ series (but then again, neither are 4AGEs unless serious dollars are invested) kudos for the correction Hiro ;)