We've been buying these and have not had any problems: http://cgi.ebay.com/ebaymotors/X-HEADERS-GASKETS-FORD-351C-4-BBL-302-BOSS-MU STANG_W0QQcmdZViewItemQQcategoryZ33631QQihZ010QQitemZ200164085726QQrdZ1QQssp agenameZWDVW Aloha from Hawaii, Dennis