After taking out all the spark plugs, we used compressed air to pressurize the cylinder we were taking the valve springs out of. This ensures that the valve does not fall into the chamber once we take the spring out. If a valve were to fall into a cylinder that is at the bottom of the compression stroke, we would then be forced to take the cylinder heads off. We then placed out spring tool on top of the valve assembly, compressed the spring, took out the retainers and locks, and simply lifter the spring out. The new one could then be installed in to same fashion. Some tools are better than other and we have to use another on the 4 and 8 cylinder as they are under the cowl with limited space.
We then headed over to the dyno and made an impressive 406 rear-wheel horsepower at 6,300 rpm and 378 lb-ft of torque at 4,600. The L99 made over 400 hp from 5,800-6,500 rpm.
We then hit the track and let this baby rip. What was the result? Low e.t. was 12.278 at 114.54 mph and we were still on the stock 20-inch Pirelli radials. Our corrected altitude was now 3,000 ft above sea-level, serving notice that there are 11-second e.t.'s waiting to be unleashed by this F-body.