The best replacement for 5.4 is 4.6.

The best alternatives to 5.4 are rated as following:
★★★★★  4.6
★★★★  5.0
★★★  5.3
★★★  6.8
★★★  ecoboost
★★  5.8
★★  6.2
★★  5.0 f150
★  5.7
★  4.6 ford
★  v10
★  4.6 f150
★  7.3
★  6.2 raptor
★  4.6 mustang
★  chevy 5.3
★  4.6 engine
  5.7 vortec
  6.2 ford
  chevy 6.0
  gm 5.3
  vortec 5.3

Your alternative for 5.4 is not listed? Suggest!
Speaking about 5.4, one probably shouldn't forget about apache 2.2.

Other search terms related to 5.4 and their ratings are:
★★★★★ apache 2.2
★★★ 4.6
★ apc
You have in mind a companion for 5.4 and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of 5.4 in all years. Click on graph for more.
5.4
4.6
5.0