Why would a 4.6L engine block be stamped 5.4L?

Benjamin Tolin

Asked by Jun 16, 2016 at 07:33 AM about the 1998 Ford F-150 XLT Stepside SB

Question type: General

I bought my F150 new in 1998. It only had 8 miles on it when I drove it home.
All badging, plastic trim on the upper side of engine,, and VIN all say it's a 4.6L.
The block is stamped on both sides 5.4L. Always wondered if it was actually a
5.4L.  I've driven other F150's  with a 4.6L and they don't have the power that
my truck seems to have. My MPG at it's best was around 18 mpg. Are the
blocks the same for both engine sizes?

2 Answers


If you can get a clear view, There will be more "engine" (block) above the freeze plugs on a 5.4. The deck is substantially taller on the 5.4, 2.5cm. The cam covers are different Passenger side Romeo 4.6 has 11 bolts and the Windsor has 14. Look, for a W (Windsor) only the 5.4 was manufactured there in '99. Regards A Ford EXPERT, can tell much more I"m sure.

1 out of 1 people think this is helpful.
Bob Beaman

5.4, look for "X" gussets above the oil pan rails on the block. A good read is here....http://www.modularfords.com/threads/79320- this-should-answer-alot-of-5-4-2v-questions

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