After the Chris Starnes heads and Nextek spring upgrade, we dynoed the car. We did an initial, low RPM pull just to see how things were acting and to be sure the A/F wasn't too far off. It looked good and we made some minor A/F adjustments. The next pull I was going to take it to about 6K, but the car started breaking-up at about 4500 rpm. Tried a couple more times and the same thing kept happening. Finally went up on part throttle and "worked it" past the break-up point and it went right on up the scale. We were in the "what the hell" mode. Fuel pressure looked good. A/F looked good except around the breakup point. It isn't spark or it wouldn't have gone up to 6K. Only thing data wise is the Load spiked way up just before the breakup. Since the load is a function of the MAF count and engine RPM, I pulled the car off the dyno and went under the fender and checked out the MAF. Took it off, cleaned it, re-installed it and put it back on the dyno. No change!! At this point I got CEL. Checked the code and it was a Crank Sensor Position Sensor Failure. AH-HA! Went under the car and it turns out the sensor wire was touching the rotating A/C pulley and was apparently grounding out when the motor was vibrating at certain RPM. Tell me that isn't new and different! A piece of electrical tape later and the car ran perfectly.

We did a few pulls and some MAF Curve teaking and the car ran great. With 5 degrees less timing and no ice in the intercooler the car gained 20hp with the new heads and springs. I am extremely happy with those results. Hopefully I can convert those gains into a 9 second pass at the track.