12 new Arias pistons for a 526 cubic inch Hemi. These were used in a blown alky pulling truck application. The pistons measure 4.43 the wrist pin is 1.094 and the ring grooves are 3/16 1/16 and dyke top ring. The combination was a 4.25 crank and a 7.15 rod. Also included is 2 sets of wrist pin buttons and 7 used wrist pins. The pistons have no grooves for pin locks. The pistons are new.