Was discussing this with Jamie, our thoughts were that the stock ports are massive, but the exhaust valve could go a little bigger. Suffer a little in terms of velocity, but flow up top would've been beneficial?
Unfortunately this occurred after the head had been torqued down and given that two of the bolts had to be coiled, I didn't want to risk pulling it off.
Given the similarities between our builds will be interesting to see the difference. I expect we will make around the same power. But differences in curve will be curious to see