The best replacement for gt40 is gt40p.

The best alternatives to gt40 are rated as following:
★★★★★  gt40p
★★★  gt40p heads
★★  cobra intake
★★  e7
★  z06
★  trick flow intake
★  afr 165
  e7 heads
  351w heads
  zo6
  gt40x
  ford gt
  corvette z06
  330 p4
  e7te
  e7te heads
  gt40r

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