No. 5Before the first pull, we made a minor fuel system change. We replaced the Wilson 1-inch four-hole spacer with a 1 1/4-inch open spacer and made no other changes. We gained 10.1 lb-ft of torque and 6.4 hp.
No. 6Before the sixth pull, we made a minor fuel/air adjustment and spun the crank again. This is what happened. We gained 8 hp and 0.7 lb-ft of torque.
No. 7When 36 degrees of total advance didn't do it for us, we retarded the ignition timing to 32 degrees BTDC. We gained 2 lb-ft of torque and virtually no increase in horsepower. When you look at brake-specific fuel consumption (BSFC), there's essentially no change with adjustments to ignition timing.
No. 8Another 150-mile journey to Ontario witnessed Elvira's 331 back on Westech's dyno, for another shot at fame, and 500/420. Here's what happened on the first pull of the day.