My next batch of tests were 6 different reed sets on a stock 31158 WB820 reed cage.

The top 4 sets are the ones that Ryan Courts sent to me for evaluation. I will test the G.E.M. G1158 reeds as soon as I figure out where I put them.

Results:

My calculations show that a WB820 needs 38.0 CFM at 8,000 RPM. The Boyesen 620 results surprised me. Might need to dust off one of the engine dynos. :^)