Depressing Dyno...

[89 Cobra LX]

Originally posted by exgmguy
Falling off at 5 grand could mean a whacked out air/fuel ratio, mis adjusted valves, bad valve springs, improperly installed cam, just to name a few.

exgmguy is right. Something is wrong with your combo, you should be making peak power closer to 5500-5600 RPM. I had a similar problem at the dyno and after a lot of $ and time we figured out the idiots that put the motor together had the cam in wrong. It was off by a tooth. After reinstalling the cam it was worth 40hp.

I hate to say this but your problem looks scarily close to mine. I was making peak power at 4900 RPM before I fixed the cam.