Which aluminum alloy? 4.89K viewsMarch 7, 20170 friedchickenhawk March 7, 2017 0 Comments I have a C-Series aluminum intake, part number 6227c and I need to do some repairs on it. What aluminum alloy is used for this part? 1 AnswerActiveVotedNewestOldest 0 OFFYEXPERT159 Posted April 3, 2017 0 Comments All Offenhauser Manifolds use 319 Aluminum alloy; weld with number 4043 rod- 3/32 diameter. You are viewing 1 out of 1 answers, click here to view all answers. Register or LoginOffenhauser Sales Corp, 5300 Alhambra Avenue, Los Angeles, CA 90032Phone: (323) 225-1307