Dyno's are just that, not real world. I'm not here to argue one way or the other but I know for a fact that I have a 318 with 302 heads that makes over 500 HP with 1.78 and 1.60 valves, non roller and can and has run 87 pump gas and still run mid 11's for et's, 3330 lbs car.
Larger valve's don't mean more performance in every case, and from what I've learned not in this case. 30 years + racing.
Yes I agree with you it's only .030 larger but from ports and cc's this makes a big difference in flow, now mind you don't get to racing flow benches, as a head that we did and flowed great numbers actually lost power on the engine. And others that didn't flow so well made large HP gains.
I've talked to you before and discussed port shapes and flows about 5 years ago, since then I've found better shapes and how to get more flow from less. It's all a learning curve. Hey thats what were here for is to learn, and find out what works and what doesn't.
