Just a few questions for the 847 owners. What are your optimum shift points? Have you ever ran into valve float? What valve springs are you using? Do you have a rev kit?

Frank

 

I shifted stock heads at 6700-6800 ish.

Springs are k motion k-800, no float, no rev kit.

 

 

GTP-6. I shift my car at 6200 NA and 600 on the bottle. Makes power to 6800 (383rwhp through a th400) though but I do not run any quicker reving it higher.

 

lol. Power is drops off right in there, but is pretty flat to that point. You can feel it when it needed to be shifted. I also put the hp/rpm into a program that did the calculus to find the ideal area under the curve of the HP graph based on tranny ratios, and it wanted to be shifted there too.

 

My transmission keeps me from shifting higher than 6400 or so (factory tach).

But I'm using the K-motion K-800s as well. I installed them at 1.95 and had to have the seat of my afrs lowered about .100 to get the height with a steel seat. If I stay in gear it will rev over 6500, but when I shift the tranny bucks and snorts, I have to pull my foot out of it for it to shift, if I shift before 6500 it shifts fine.