Re: LS6 or LS7 cam?
Depending on how much lift and duration change you do may need custom programming as the manifold pressures are gonna change causing map sensor inputs to ecm to change your timing and fuel curves. Minor changes can be adjusted for with stock programming. Major changes will throw codes and run rich typically.
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1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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