Before I install the 4k gsk I was wanting to know what to expect from them. What kind of rpm range, about where should it start defueling, will the throttle be real touchy or like it is stock with just a higher cutoff. Hopefully someone is running these springs in a similiar truck so they can fill me in on what to expect.

 

Not sure about the 4k really, but my 3k made the throttle more touchy for sure. Less pedal for more throttle now. Im guessing it will pull all the way to 4k if your timing is good, and you have the valve springs.

Eric

 

My friend has them in his 98 12v in his truck it just seemed to pull for ever. I know his will bury the 4 grand stock tach. The throttle on his didnt change a whole lot. I kinda want them but i am just scared to spin er up that high