Not sure yet what happened, I was doing a 3rd gear pull from 2500-6000 and when I pushed in the clutch at the end the car stalled. I got it restarted to get it home but smoke was pouring out of the valve cover vent hole. I was datalogging at the time but it doesn't show anything that would make this happen, I almost felt something let go just after I pushed the clutch in. Compression is way down #1-100psi #2-180psi #3-90psi #4-90psi so that can't be anything good, hopefully its not totally destroyed and can be rebuilt.