Re: Valve marks on head

Posted by Sherlock On 2017/6/16 14:20:46

Still wondering about those plug sizes. An Autolite chart I downloaded says 1931 could use 7/8-18 or 18 mm or 14mm plugs while 1930 could use either 7/8-18 or 18mm. However, the '30-'32 Service Parts List says all 7th and 8th Series use the same plug which is identified as 5/8"-18. I've seen a reference to 5/8" nowhere else. I figure the Service Parts List would be more reliable than the chart as it relies on Series designations rather than the year, but don't understand the reference to 5/8"-18. 5/8" = typo?

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