According to the SVT tech that did the job it sounds that way normally. Oh BTW I found out after I did the ordering and swapping that the heads on my GT were Romeo heads and I changed them, accedentaly, to Windsor heads. A word to the wise Ford made windsor and romeo heads for the 00-04 mustangs. Only way to know is look at the bolts from your timing covers to your heads. If they are 8mm bolts you got a romeo head and if there 10mm bolts there windsor heads.