[SSLance]

He couldn't find his O2 sensor as he almost never uses it. As he explained to me the dyno calculates the ratio based on the fuel that goes in and the air that comes out of the engine. That is the far right column on the two sheets.

He said that 0.500 is right at 12:1, when the number gets down into the 0.4xxs it is leaning out a bit and making more power...up into the high 0.5xxs to the 0.6xxs is getting richer.

On the pull without the air cleaner, at 5400 (peak HP) it was 0.590 and the pull with the air cleaner it was 0.539.

The fuel lb/hr column shows it using 189.9 without the AC and 181.4 with the AC, so it was using less fuel to make more power by running leaner with the air cleaner and spacer. In other words the AC and spacer let more air get into the engine faster and smoother.

At 4100 (peak torque) it was 0.497 without the AC and 0.475 with the AC, fuel consumption was 134.9 and 143.0 respectively.

So it was using more fuel and running leaner at 4100 RPM with the AC and making 48 more ft lbs of torque.

BTW, this was all done with the distributor locked down at 32 degrees timing, no advance, no curve, no nothing...just 32 degrees timing and burning 91 octane pump gas.

I have an A\F meter in the car and will verify that it's still safe once all back together and on the road, but I'm certain that it will be fine even if I stumble on a bad tank of gas somewhere along the line.