CR and pump gas question

IQ52 said

These people were not testing for detonation resistance specifically, but the results are interesting....................

Comparing Aluminum And Iron Cylinder Heads - Car Craft Magazine

Iron vs. Alloy Engine Heads - Tech Article - Chevy High Performance Magazine

Click to expand...

I read the bottom link. I has seen it before. There is a 7cc difference in the port volume, with the iron head being smaller. When the ports start getting that big, 7cc is a pretty big difference.

I'd love to see both heads on a flow bench.