A man at a recent car show asked me whether or not the factory matched HIPO heads by the casting numbers; 19 with 19 or 20 with 21 etc. Mine are not matched - I have a 19 and a 21 casting number. Ones that I have observed have not been matched. Can anyone help with an answer?
Jack
Edited by - SixT5HiPo on 07/27/2010 00:25:57