Must be 3.5 (not have 3.9 or 4.2 embossed). HRC1579 is the casting number.
T turbodave Well-known member Nov 26, 2008 325 3 KY Aug 31, 2019 #1 Must be 3.5 (not have 3.9 or 4.2 embossed). HRC1579 is the casting number.
