Re: spark plugs

Posted by JWL On 2015/4/24 16:51:08

I believe Packard in those years used a spark plug with a 3/8" reach (the length of the threaded portion). Your car may have been fitted with spark plugs of 7/16" reach. The old Champion designator for the shorter plugs was the "J" type and the longer plugs were "H". Js and Hs came in the same heat ranges, but differed in reach. Of course the designation of spark plugs has changed over the years and new numbers are now being used. Someone will come along to advise you on the correct plugs for your Packard.

(o{}o)