Re: packard six 1939 timing marks

Posted by Owen_Dyneto On 2018/4/17 7:03:16

i am removing the head today checking with a dial gauge to find TDC i

Seems a bit drastic. You can set the timing quite accurately "by ear"; just open the passenger window, find a quiet stretch of road with a modest upgrade, and while climbing the grade in high gear with heavy throttle, incrementally keep advancing the timing until you hear just a hint of spark knock or preignition. This can provide more optimized timing than using the original timing specification because it will compensate for changes in compression ratio (cylinder head being resurfaced?) and the octane of the fuel in use.

If you continue to have overheating issues after this process, you can eliminate retarded timing as a cause.