iam having some problem with my car.
I have put in a cam 224/231 578/588 114 and ebay lt headers and ory.
I have tuned it my self with hptuners,and at wot the afr is 12,5-12,7 and timing 26.

but it feels like i had more power when the car was stock,and iam having problem revving the car past 6000rpm.

new melling oil pump/o-ring
new lifters
ls2 timing set/adjust sprocket
new 7.425 pushrods ~0.087 preload
single springs .600" lift
new walbro fuel pump.
old ngk iridium plugs
new cheapo red plug wires

 

Do you have any way to put the car on a dyno? Without seeing a graph it will be hard to tell what the problem is, especially since it seems valvetrain related to me.

 

today i started to change out the plugs to new ngk tr6,and at the same time,do a compression test.
all cylinders on the driver side was ~190psi.
I will do the rest tomorrow.

dyno is expensive here,a full dyno tune costs 1200

 

now i have changed all the plugs,and the compression was 190-220 is that okey?

 

Yes that is where you would want the test to be at. Is the car throwing any codes or making any funny noises? Is the valvetrain really loud?