If the 2.02 is done right, not only will the viscosity go up( not down) but it could go too high and cause a choke issue.
I fill that a 2.02 would make more power then 1.88 even in a stock 360 with a stock cam........Why.......
This is how i look at it!
2.02 will flow more air, sooner, then a 1.88. Because there's more "area" at the seat.
The 2.02 flow 20esh more cfm. with out porting. The head will port stall
at the same lift as it did with the 1.88......but will produce more cfm up to that point.
Granted there would be vary little HP gain from a 1.88 to a 2.02 w/"Stock port" head and stock cam.
I really don't fill the 2.02 would loose ANY bottom end torque, ...... Now if you got out of hand, in the bowl blend(opening up instead of cleaned up) You can kill all the bottom end.
ask me how i know.:angry7: