Re: spark plugs

Posted by PackardV8 On 2015/4/25 15:32:11

Thanks Owen. I went and cchecked my 1976 AC Delco book. The PREfix "LM" indicates Lawn Mower.
However, the "49" (4 = 14mm, 9 = very hot heat range) does not appear in my book. Only 42 thru 48.