The best replacement for 455 is 454.

The best alternatives to 455 are rated as following:
★★★★★  454
★★★★★  452
★★★★  460 rancher
★★★★  400
★★★  460
★★  440
★★  290
★★  stihl 290
★  403
★  savage mark ii
★  chevy 454
★  450
★  ruger 77 22
★  453
★  pontiac 455
★  olds 455
  430
  buick 455
  428
  346xp
  cz 452
  ruger 10 22
  x495
  455
  426 hemi
  454 engine
  stihl ms290

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