Maybe I've learned a good lesson . . .

Thanks! I missed that.
I don't know if this is an issue of what they did or relates to the difficulties of running inertia dynos at lower rpms.


Some differences he mentioned shouldn't have mattered (electric fan)
Maybe I also missed it, I'm assuming the airgap rpm was the final intake along with the ported heads. Not sure about the carb.
If so, it wouldn't surprise me if the ported heads are hurting velocity in the street driving rpm range.