X-Head Porting....

The first......”porting”.......I did was on some 906 heads.
I had no idea about what I was doing .......at all.
This was in the mid-80’s.
I used an air grinder powered by a 1hp craftsman compressor.
Yeh......... the grinder speed wasn’t very fast.
And I was using “stones”.

I barely even scratched the surface on those heads....... I don’t think I hurt them any, but in hindsight....... what I did was a waste of time(other than to get my feet wet with doing that type of work).

Since that time I’ve learned that on most stock heads........ knowing where to do the first grinding can pay nice dividends for fairly minimal work....... and that after the initial first work is done, the flow vs time spent porting is a pretty steep curve of diminishing returns.