Which are the proper plugs and gap for a '71 Merc 400?
K KPKID Seaman Joined Aug 26, 2008 Messages 51 Nov 28, 2009 #1 Which are the proper plugs and gap for a '71 Merc 400?
Barnacle_Bill Admiral Joined Feb 8, 2004 Messages 6,469 Nov 28, 2009 #2 Re: plugs http://www.ngksparkplugs.com/apps/watercraft/partcloseup.asp?stocknumber=2622&partnumber=BUHW#
Re: plugs http://www.ngksparkplugs.com/apps/watercraft/partcloseup.asp?stocknumber=2622&partnumber=BUHW#
