Keith Black Hypereutectic Flat top Pistons. New in Box. Set of 8. Part number KB281-30. For 4.030 bore, 3.000" stroke crank, 5.090" long rod. 9.6cc with 58cc head, 9.1cc with 64cc head. $200.00. Will ship in the US only. Paypal accepted. Picture available. email dragbike425@hotmail.com