12-01-2010, 09:08 AM
|
|
CC Member
|
|
|
Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
|
|
Not Ranked
I wouldn't call it diminishing returns since rpms make horsepower, but in terms of reliability, I would say anything over 6400-6500 would start to see a decline.
|