Wait a sec.
He stated they were 1.6rr. I was interested because I have 1.9s and wanted to sell or trade for 1.6rr.
Then his description page states they are in fact 1.9s. So I replied asking how can you pull off running such a high ratio rocker with a cam?

I would assume the heads are NOT modified if he thought they were 1.6 stock ratio.

I have yet to find out how hard/easy it would be to run my 1.9s rather than sell or trade them

Thanks