identifying my engine block

D.J. (Student)

New Member
Jan 6, 2021
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new jersey
Hello, i have a 1999 mustang gt. im trying to figure out if my engine block is a 5.4l or 4.6l. i think one of the previous owners might have swapped the engine because the heads on the engine have the code RF-XL3E-6090-C20D PI. that code correlates to a 1999 f150 5.4l. and i am trying to figure out if my block is a 4.6l or is the entire engine a 5.4l. anyone that knows how to figure this out please help.
 
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tsemmett

Active Member
Jul 2, 2019
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An XL3E is a Windsor PI head. 99-00 Mustangs also used this head. You would need the casting numbers off the block itself to verify if this was 5.4 swapped.