Won't rev over 6100
 

Ok got my new car dynoed over the weekend. Everything went great except the car would not rev over 6100. At 6100 it was like the car hit a brick wall. The upgrades are ls6 intake, lid, Long tubes, full 3" no cats, 1.85 rockers, and hardened push rods. Nothing was showing up with the tune or the data log. Fuel,spark,timing,injectors were all good. The only thing we didn't know about was if the previous owner changed valve springs when he put the rockers and pushrods in. Let me know please what you guys think.

If the valve springs weren't changed, you may have floated the valves.

Thats what I was thinking but I wanted to check withthe ls1 gooroo's

If you are one the stock cam, you really do not need to go past 6100 very much.

you're hitting the rev limiter...lol

Your funny. Iam not that stupid. Plus the limiter is set at 6400.

Yes I know this we figured we would push it a little farther. It just won't go there. We set the shifts at 6k anyhow. I was just trying to get some info on possibly problem.

If you are losing control of the valve train, it will show up very well on the dyno. Just be careful as you don't want to kiss a piston.

I am pretty sure you are floating the valves that high on stock springs, even with a stock cam.

Thats the thing that threw us. Nothing should up on the dyno. Thats why Iam searching for an answer

I had the same thing happen with my old 5.3L, at 6200 seemed as though is was hitting a brick wall. I did kiss some pistons, no bent valves and ran it for a couple more months. Problem was caused by not enough seat spring pressure.