header friendly sub for r44xls
 

Have zz502 with headers ,orig r44xls plugs , 13/16 base and will have to pull headers to get plugs out .thought there was a ngk number that crossed for the alum head marine header combo . With a 5/8 base extended reach .Tight engine bay fit . Can pull headers back hopefully without complete removal ,trying to look out for the next guy lol especially if its me years later