Been reading a few things on porting and can't say I really understand it that well. From what I can tell it seems narrower carbs and more compression will add to low end torque. Also, it seems lower exhaust porting is probably good for low end torque.

Anyone know which 2.5 engine is ported to favor low end torque? Namely, would it be the 135, 150, 175, 200, XR6, EFI, Optimax, ProXS, etc?