The best replacement for ls6 is ls1.

The best alternatives to ls6 are rated as following:
★★★★★  ls1
★★★★★  ls2
★★★  ls7
★★★  ls3
★★  ls2 intake
★★  fast intake
★★  ls1 intake
★  ls1 block
★  fast 92
★  fast 102
★  ls1 intake manifold
★  ls5
★  lq9
★  lq4
  ls2 heads
  ls2 intake manifold
  ls16
  ls2 cts v
  truck intake
  ls1 heads
  lt4
  fast 90
  ported fast 78
  lt5
  ls2 engine
  ls2 better

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