I measured a couple of head volumes today:

2006 chamber with a 0.004 surface cut 69cc
2006 intake runner mild port - 190cc
2006 exhaust runner ported (to get 72/74% flow it needs to go bigger)- 93cc

2002 stock exhaust runner 81cc

51 GMC 4.2 turbo
Can't solved today's problems using the same technology/thinking that created them