RHS head valve train geometry issue

I think the guys name was screws that put up the different rockers to show how far off standard meassurment ments were in the rocker industry, I had this problem also another problem was a stock valve coveror a mopar performance valve cover did not fit correct. milling on the head had to be done to let the valve cover sit down properly so I wasn't blowing oil all over, try to see if you valve covers sit down and cover all the way around . why indy would care I don't know ,but they are 4 hours from me brian at imm told me 4.925 to 5.1 valve , you do the math ,that's a huge difference , I did not buy mine from brian just called for help. hughes is sending me a roller rocker for $22.00 to try measuring and I can return if I do not like the fit yet . I donot understand why compcams shaft r rockers don't fit right on there heads . any1 gets any info can we please shoot out to every 1 .I went threw 1.6 crane gold rrockers , tried old flat mopar rockers and now comp cams , they said blbllblbldahi duno. So you are not alone , I think gr8 marketing sold us a load of chit . every 1 bombard compcams tommoro and make there day miserable as we can I'm out 2300.00 and NOT HAPPY ,iwill put up pics tomorro night